The number of grams of solute in of a 0.189 m KOH solution is 8.42 x 10^-4 g Therefore, the correct answer is option b.
To calculate the number of grams of solute in of a 0.189 m KOH solution Here's how: Given, molarity of the KOH solution, M = 0.189 mol/L The formula to calculate the molarity of a solution is as follows: Molarity (M) = Number of moles of solute (n) / Volume of solution in litres (V).
We need to calculate the number of grams of solute. We can use the formula given below: Mass = Number of moles * Molar mass We can calculate the molar mass of KOH as follows: Molar mass of KOH (K = 39.10, O = 16.00, H = 1.01) = 39.10 + 16.00 + 1.01 = 56.11 g/mol Substitute the values in the formula: Mass = 0.189 mol * 56.11 g/mol = 10.59 g (approx.)Therefore, the number of grams of solute in 0.189 m KOH solution is 10.59 g (approx.).
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What material is made from the sap of a tree?A) GlazeB) JadeC) LacquerD) Porcelain
C) Lacquer is the material made from the sap of a tree.
Lacquer is a material derived from the sap of the lacquer tree, scientifically known as Rhus vernicifera. The sap, commonly referred to as lacquer or resin, is harvested by making incisions in the bark of the tree. It is then collected and processed to create lacquer, which has been used for centuries in various cultures for decorative and protective purposes.
The sap of the lacquer tree undergoes a specific curing process that involves exposure to moisture and air. This process results in the formation of a durable and glossy finish. The lacquer can be applied to different surfaces, including wood, metal, or even paper, creating a smooth and shiny coating that enhances the appearance and provides protection against moisture and wear.
It is important to note that glaze, jade, and porcelain are not materials derived from the sap of a tree. Glaze refers to a glass-like coating applied to ceramics, while jade is a mineral used for carving and jewelry. Porcelain, on the other hand, is a type of ceramic material composed of clay, feldspar, and other minerals.
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How did Buddhism become a formal religion after the death of the Buddha?
Followers continued to share the Buddha's teachings.
Buddhism was replaced with Jainism.
The Buddha had written down his teachings in laws.
Asoka's religious intolerance allowed only one religion.
After the death of the Buddha, Buddhism became a formal religion through the efforts of his followers, who continued to spread his teachings and organized into communities known as sanghas. Over time, these sanghas developed a system of governance, with monastic councils, hierarchical structures, and formalized practices and rituals.
One key factor in the formalization of Buddhism was the development of the Tripitaka, a collection of the Buddha's teachings, which were written down in the Pali language and preserved by monastic communities. The Tripitaka contains three major sections: the Vinaya Pitaka, which outlines the rules and guidelines for monastic life; the Sutta Pitaka, which contains the Buddha's discourses on a wide range of topics; and the Abhidhamma Pitaka, which provides a detailed analysis of Buddhist psychology and philosophy.
The spread of Buddhism was also facilitated by the patronage of rulers such as Asoka, who supported the religion and helped to spread it throughout his empire. However, this support was not always consistent, and Buddhism faced periods of persecution and decline in various parts of the world. Despite these challenges, Buddhism has continued to evolve and adapt over the centuries, with different schools and traditions emerging in different regions. Today, Buddhism is practiced by millions of people around the world, and continues to offer a unique and powerful perspective on the nature of reality, the human condition, and the path to liberation.
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Based on what you have learned about currents, how do you think this mass of trash ends up in the Great Pacific Garbage Patch?
Looking at the map, what ideas do you have about why the trash is "trapped" in this location?
PLEASEE HELP IM DESPERATE
You'll have 20.5 g of hydrochloric acid (HCl) left, which is the answer to your query.
The least amount of hydrochloric acid that can be produced?Data
HCl = 31.4 g
NaOH = 12 g
insufficient HCl =?
equilibrium in a chemical reaction
NaCl and H2O are produced from HCl and NaOH.
HCl's molar mass is equal to 1 + 35.5 = 36.5 g.
NaOH's molar mass is 40 g (23 + 16 + 1)
Figure out the limiting reactant.
Theoretical yield: 36.5/40 = 0.9125 for HCl/NaOH.
Research yield: HCl/NaOH = 31.4/12 = 2.62
Conclusion
Because of the increasing experimental yield, NaOH is the limiting reactant.
The excess reactant's mass should be determined.
35. 5 g of HCl ———————— NaOH weight 40 g
x ———————— NaOH in 12 g
x = (12 x 36.5) / 40
x = 438 / 40
x = 10.95 grams of HCl
Surplus HCl = 31.4 - 10.95
= 20.5 g
You'll have 20.5 g of HCl left, which is the answer to your query.
The complete question is,
To create aqueous sodium chloride and liquid water, aqueous hydrochloric acid must be combined with solid sodium hydroxide. Consider combining 12.g of sodium hydroxide with 31.4g of hydrochloric acid. Determine the smallest amount of hydrochloric acid that could possibly remain after the reaction. The quantity of significant digits in your response must be accurate.
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PLEASE HELP!
The chemical reaction shown is exothermic.
CH4 + N2 + H2 → CH3N + NH3
Which statement about the reaction is correct?
(1 point)
Responses
Each reactant has more chemical potential energy than each product.
Each reactant has more chemical potential energy than each product.
It takes more energy to form C–H bonds in the reactants than is released from C–H bonds in the products.
It takes more energy to form C–H bonds in the reactants than is released from C–H bonds in the products.
The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.
The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.
More chemical potential energy is stored in the bonds of CH4 than in the bonds of CH3N.
Exothermic reactions, release exceeding chemical energy from the reactants. Before its release, the energy is turned into another form, heat or light. C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.
What is an exothermic reaction?An exothermic reaction is the chemical reaction that releases energy as heat or light when the reactants turn into products.
Reactant molecules have more energy than the product molecules, and hence, the remaining energy must leave the system. So part of the chemical energy from the reactants is released as another type of energy (heat or light).
Usually, oxidation reactions are exothermic.
The correct option is C) The total chemical potential energy of the reactants is greater than the total chemical potential energy of the products.
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DNA can be found on long strands of?
Answer:
DNA bases pair up with each other, A with T and C with G, to form units called base pairs. Each base is also attached to a sugar molecule and a phosphate molecule. Together, a base, sugar, and phosphate are called a nucleotide. Nucleotides are arranged in two long strands that form a spiral called a double helix.
write the balanced chemical equation for the first dissociation of the polyprotic acid h2so3 in water.
Balanced chemical equation first dissociation of the polyprotic acid H₂SO₃ in water is: H₂SO₃ (aq) + H₂O (l) ⇌ HSO₃⁻ (aq) + H₃O+ (aq)
Polyprotic Acid is a chemical that can donate more than one proton. Diprotic and Triprotic are two distinct varieties of polyprotic acid that can, respectively, donate two and three protons.
The most easily dissociable acid is that with the greatest dissociation constant (Ka) value. Sulfuric acid (1) easily separates from the nine substances listed in the table. The first dissociation constant, Ka, has the largest value, then the second, and so on.
In this equation, the polyprotic acid H₂SO₃ reacts with water (H₂O), resulting in the formation of the bisulfite ion (HSO₃⁻) and the hydronium ion (H₃O⁺).
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A combustion analysis of 1.200 g of an anhydrous sodium salt gave 0.942 g of CO2, 0.0964g of H2O, and 0.246 g of Na. The molar mass of the salt is 112.02 g/mol.
a) what is the chemical formula of the salt?
b) the salt contains carboxylate groups and the C atoms are bonded together. Draw the lewis structure
c) 1.50 g of this salt was dissolved inw ater and diluted to 50.0 mL. Is the dissolved substance an acid, a base, or amphiprotic? Calculate the pH. (Ka1 = 0.059, Ka2=0.000065)
Answer:
To solve this problem, you need to follow these steps:
(a) To find the chemical formula of the salt, you need to determine the empirical formula of the anion and then combine it with the sodium cation. To do this, you need to calculate the moles of C, H, and O in the anion from the given masses of CO2 and H2O. Then, you need to divide the moles by the smallest value to get the simplest ratio of the elements. Finally, you need to multiply the ratio by a factor to get the whole number of atoms that matches the given molar mass of the salt.
Using this method, the calculation can be done as follows:
Moles of C in the anion = (0.942 g CO2) / (44.01 g/mol CO2) x (1 mol C / 1 mol CO2) = 0.0214 mol C
Moles of H in the anion = (0.0964 g H2O) / (18.02 g/mol H2O) x (2 mol H / 1 mol H2O) = 0.0107 mol H
Moles of O in the anion = (0.942 g CO2) / (44.01 g/mol CO2) x (2 mol O / 1 mol CO2) + (0.0964 g H2O) / (18.02 g/mol H2O) x (1 mol O / 1 mol H2O) = 0.0535 mol O
Simplest ratio of C, H, and O in the anion = (0.0214 / 0.0107) : (0.0107 / 0.0107) : (0.0535 / 0.0107) = 2 : 1 : 5
Factor to get the whole number of atoms = (112.02 g/mol) / [(2 x 12.01 g/mol) + (1 x 1.01 g/mol) + (5 x 16.00 g/mol)] = 1
Empirical formula of the anion = C2H1O5
Chemical formula of the salt = NaC2H1O5
Therefore, the answer is NaC2H1O5.
(b) To draw the Lewis structure of the anion, you need to count the total number of valence electrons, arrange the atoms around the central atom, connect them with single bonds, and distribute the remaining electrons to satisfy the octet rule. To do this, you need to know that carbon has 4 valence electrons, hydrogen has 1, and oxygen has 6. You also need to know that the salt contains carboxylate groups (CO2-), and the carbon atoms are bonded together.
Using this method, the drawing can be done as follows:
Total number of valence electrons = (2 x 4) + (1 x 1) + (5 x 6) + 1 = 40
Arrangement of atoms = C-C-O-O-O-H
Single bonds = C-C-O-O-O-H | | | |
Remaining electrons = 40 - 12 = 28
Distribution of electrons = C-C-O-O-O-H | | | | … … … … … … … …
Therefore, the Lewis structure of the anion is:
O- O- O
// | \\
C-C-O-H ..
| | | ..
.. .. ..
To determine the acidity or basicity of the dissolved substance, you need to identify the conjugate acid-base pairs and compare their relative strengths. To do this, you need to know that the salt is the product of a weak acid (C2H2O5) and a strong base (NaOH). You also need to know that the carboxylate groups can act as weak bases and accept protons from water, forming bicarbonate and carbonate ions. You also need to know that the given Ka values are the acid dissociation constants of the weak acid and its conjugate base.
Using this method, the analysis can be done as follows:
Conjugate acid-base pairs = C2H2O5 / C2H1O5- and C2H1O5- / C2O5(2-)
Relative strengths = C2H2O5 is a weak
Explanation:
a steel bottle contains argon gas at standard temperature and pressure. what is the final temperature if the pressure is changed to 2.76 atm?
When the pressure is changed to 2.76 atm, is approximately 754.19 Kelvin. When the pressure inside the steel bottle is changed to 2.76 atm while containing argon gas at standard temperature and pressure (STP), the final temperature of the gas will increase.
According to the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin. Since the volume remains constant in this case, we can rearrange the equation as P₁/T₁ = P₂/T₂, where P₁ and T₁ are the initial pressure and temperature, and P₂ and T₂ are the final pressure and temperature. Given that the initial conditions are at STP, the initial temperature is 273.15 K. If we substitute the values into the equation, we get 1 atm / 273.15 K = 2.76 atm / T₂. Solving for T₂, we find T₂ = (273.15 K) * (2.76 atm / 1 atm) ≈ 754.19 K.Therefore, the final temperature of the argon gas in the steel bottle, when the pressure is changed to 2.76 atm, is approximately 754.19 Kelvin.
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A) Calculate the percent ionization of formic acid (HCO2H) in a solution that is 0.311 M in formic acid and 0.189 M in sodium formate (NaHCO2). The Ka of formic acid is 1.77 × 10-4. ( Answer:0.0952)
B)5) Suppose you have just added 100.0 ml of a solution containing 0.5000 moles of acetic acid per liter to 400.0 ml of 0.5000 M NaOH. What is the final pH? The Ka of acetic acid is 1.770× 10-5. ( Answer:13.48)
A) The percent ionization of formic acid is 0.0952.
B) The final pH is 13.48.
How to calculate percent ionization and final pH?Explanation for Part A:
When calculating the percent ionization of formic acid (HCO₂H), we consider the concentration of H⁺ ions compared to the initial concentration of formic acid. In this scenario, we have a solution with a concentration of 0.311 M formic acid and 0.189 M sodium formate (NaHCO₂). Since sodium formate dissociates completely, it serves as a source of H+ ions.
In this case, we can assume that the contribution of H⁺ ions from sodium formate is significant compared to the ionization of formic acid. Therefore, the concentration of H⁺ ions is equal to the concentration of sodium formate, which is 0.189 M.
To calculate the percent ionization, we use the formula:
percent ionization = (concentration of H⁺ ions / initial concentration of formic acid) x 100
Substituting the values, we have:
percent ionization = (0.189 / 0.311) x 100 = 0.0952 x 100 = 9.52%
Therefore, the percent ionization of formic acid in the given solution is 0.0952 or 9.52%.
Explanation for Part B:
When mixing acetic acid (CH₃COOH) with sodium hydroxide (NaOH), a neutralization reaction occurs. Acetic acid is a weak acid, while sodium hydroxide is a strong base. The reaction between the two results in the formation of water and sodium acetate (CH₃COONa).
To determine the final pH, we need to consider the reaction and the resulting species in the solution. In this case, we have added 100.0 ml of a solution containing 0.5000 moles of acetic acid per liter to 400.0 ml of 0.5000 M NaOH.
Since acetic acid is a weak acid, we can assume that its ionization is negligible compared to the complete dissociation of NaOH. Therefore, we can consider the solution as a strong base solution.
When a strong base reacts with water, it produces hydroxide ions (OH⁻) which leads to an increase in the concentration of OH⁻ ions. To determine the pH, we need to calculate the concentration of OH⁻ ions, which can be done by considering the moles of NaOH and the total volume of the solution.
Using the given values, we have:
Moles of NaOH = 0.5000 M x 0.4000 L = 0.2000 moles
Total volume of the solution = 0.1000 L + 0.4000 L = 0.5000 L
Concentration of OH⁻ ions = moles of NaOH / total volume of the solution
= 0.2000 moles / 0.5000 L
= 0.4000 M
Since pH is defined as the negative logarithm (base 10) of the concentration of H⁺ ions, we can use the pOH to determine the pH. The pOH is equal to -log10[OH⁻] in this case.
pOH = -log10[0.4000] = 0.3979
Finally, we can determine the pH using the relationship between pH and pOH:
pH = 14 - pOH = 14 - 0.3979 = 13.6021 ≈ 13.60
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# 3. If 3.470 g of Ba(OH)₂ is dissolved into 0.5631 L of distilled water, what is the
pH of the solution formed?
O 12.5559
O-0.7897
O 12.8569
O 1.1431
Answer:
The pH of the solution formed is approximately 12.614.
Explanation:
First, we need to calculate the molarity of the Ba(OH)₂ solution:
moles of Ba(OH)₂ = mass / molar mass = 3.470 g / (137.327 g/mol + 2*15.9994 g/mol) = 0.01156 mol
molarity = moles / volume = 0.01156 mol / 0.5631 L = 0.02055 M
Ba(OH)₂ is a strong base, and it will dissociate completely in water to give two OH⁻ ions for every Ba(OH)₂ molecule:
Ba(OH)₂ → Ba²⁺ + 2OH⁻
So the concentration of OH⁻ ions in the solution is 2 * 0.02055 M = 0.0411 M.
Now we can use the equation for the ion product constant of water to calculate the pH of the solution:
Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴
pH + pOH = 14.00
pOH = -log[OH⁻] = -log(0.0411) = 1.386
pH = 14.00 - pOH = 14.00 - 1.386 = 12.614
Therefore, the pH of the solution formed is approximately 12.614.
light of wavelength 486.1 nm is emitted by a hydrogen atom. what transition of the atom is responsible for this radiation
The light of wavelength 486.1 nm is emitted by a hydrogen atom in the transition of the electron from the n=3 energy level to the n=2 energy level. This is because the electron moves from a higher energy state to a lower energy state and releases energy in the form of electromagnetic radiation.
According to Bohr's model of the hydrogen atom, when the electron makes a transition from a higher energy level to a lower energy level, energy is emitted in the form of a photon. The energy of the photon is equal to the difference in energy between the two energy levels involved in the transition.
The hydrogen spectrum has a series of spectral lines corresponding to different energy level transitions. The line with a wavelength of 486.1 nm corresponds to the transition from the n=3 energy level to the n=2 energy level.
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the percent yield of ammonia synthesized from its elements is 20% under certain conditions. which process may increase the yield? chegg
One possible process that may increase the yield of ammonia synthesis is adjusting the reaction conditions. By changing the temperature and pressure, it is possible to optimize the reaction to achieve a higher yield.
For example, increasing the temperature can increase the rate of reaction, while increasing the pressure can shift the equilibrium towards the product side, resulting in a higher yield. Another process that may increase the yield is using a catalyst. Catalysts can speed up the reaction and lower the activation energy, allowing the reaction to proceed more efficiently. By using a catalyst, it may be possible to achieve a higher yield of ammonia. Additionally, improving the purity of the reactants and removing any impurities can also increase the yield.
Overall, adjusting reaction conditions, using a catalyst, and ensuring the purity of reactants are potential processes that may increase the percent yield of ammonia synthesis.
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Synthesis of Aspirin
Discussion – Q&A:
Explain why sodium bicarbonate is added during the work up
Write a complete reaction mech. For prep of aspirin
Explain why crystals during 1st filtration are washed w cold water
Discuss percent yield of reaction
Comment on mp of newly synthesized aspirin
1. Sodium bicarbonate is added during the work-up phase because it helps in converting any residual acetic anhydride into acetic acid and neutralizes the unreacted salicylic acid.
Sodium bicarbonate is an effective pH neutralizer. In the preparation of aspirin, after the completion of the reaction, hydrochloric acid is added to lower the pH of the reaction mixture to about 2. At this point, aspirin precipitates as it is relatively insoluble in water. After filtration, the crude product is dissolved in hot water. At this stage, sodium bicarbonate is added to neutralize the acidic impurities like the acetic acid that is produced in the reaction. The impurities become soluble and easily removed from the solution.
2. The complete reaction mechanism for the preparation of aspirin is:
3. The crystals are washed with cold water during the first filtration to remove any impurities that may be present. Coldwater is used to prevent the solubility of aspirin in water. This makes it easier to remove any water-soluble impurities and unreacted salicylic acid that may be present.
4. The percent yield of the reaction is calculated by dividing the actual yield obtained by the theoretical yield that is calculated from the stoichiometry of the reactants involved in the reaction. Factors such as incomplete reactions, losses during filtration, and errors in measurement can all contribute to a lower yield. Therefore, the yield may be less than 100%.
5. The melting point of the newly synthesized aspirin should be around 136-140 °C if the reaction was successful. A lower melting point may be an indication of impurities in the final product. The impurities could be from an incomplete reaction, the presence of water or unreacted salicylic acid.
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need answers as quickly aspossible. thank you
Answer: The empirical formula of the compound becomes \(TiCl_5\)
Explanation:
The empirical formula is the chemical formula of the simplest ratio of the number of atoms of each element present in a compound.
Given values:
Mass of Ti = 0.72 g
Mass of Cl = 2.85 g
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)
To formulate the empirical formula, we need to follow some steps:
Step 1: Converting the given masses into moles.Molar mass of Ti = 47.9 g/mol
Molar mass of Cl = 35.6 g/mol
Putting values in equation 1, we get:
\(\text{Moles of Ti}=\frac{0.72g}{47.9g/mol}=0.015 mol\)
\(\text{Moles of Cl}=\frac{2.85g}{35.6g/mol}=0.080 mol\)
Step 2: Calculating the mole ratio of the given elements.Calculating the mole fraction of each element by dividing the calculated moles by the least calculated number of moles that is 0.015 moles
\(\text{Mole fraction of Ti}=\frac{0.015}{0.015}=1\)
\(\text{Mole fraction of Cl}=\frac{0.080}{0.015}=5.33\approx 5\)
Step 3: Taking the mole ratio as their subscripts.The ratio of Ti : Cl = 1 : 5
Hence, the empirical formula of the compound becomes \(Ti_1Cl_5=TiCl_5\)
A muon decays by the reaction
(The muon decays into an electron and two neutrinos.)
To simplify we will say A ->B + VC + VD. MA = 200 MeV, mg = 50 MeV.
Before the decay, A is initially at rest. After the decay, vp goes left with a momentum of p. vc goes right with twice the momentum of VD
(2p).
a) What is the direction and momentum of B in terms of p?
b) Set up an equation to solve for p. Turn this into an equation that can be solved with the quadratic
formula. The solution is p = 44.38 MeV/c. c) Find the energy and momentum of each of the 3 particles after the decay. Use a negative sign for
negative values.
After considering the given data we conclude that the answer to sub question are
a) the momentum of particle B is -p to the right.
b) the momentum of particle B is -3p/25 to the right.
c) Particle B: E = 0.511 MeV, p = 3p/25
Particle C: E = 0.08 MeV, p = 2p/25
Particle D: E = 0.08 MeV, p = 2p/25
a) The initial momentum of the system is zero since A is initially at rest. After the decay, the momentum of the system is p to the left for particle B and 2p to the right for particles C and D. Therefore, the momentum of particle B is -p to the right.
b) Using conservation of momentum, we have:
\(p = MBVB + MCVC + MDVD\)
Since \(MB = MA - MC - MD and VC = -VD/2\), we can substitute these expressions and simplify:
\(p = (MA - MC - MD)VB - MCVD/2 - MDVD\)
Rearranging and factoring out VB, we get:
\(VB = (p + MCVD/2 + MDVD)/(MA - MC - MD)\)
Substituting the given values, we get:
\(VB = (p + 25p)/(200 - 50 - 50) = 3p/25\)
Therefore, the momentum of particle B is -3p/25 to the right.
c) The energy and momentum of each particle after the decay can be calculated using the formulas:
\(E = \sqrt((pc)^2 + (mc^2)^2)\)
p = pc
where E is the energy, p is the momentum, m is the mass, and c is the speed of light.
For particle B, we have:
\(E(B) = \sqrt((3p/25c)^2 + (0.511 MeV/c^2)^2) = 0.511 MeV\)
p(B) = 3p/25
For particle C, we have:
\(E(C) = \sqrt((2p/25c)^2 + (0 MeV/c^2)^2) = 0.08 MeV\)
p(C) = 2p/25
For particle D, we have:
\(E(D) = \sqrt((2p/25c)^2 + (0 MeV/c^2)^2) = 0.08 MeV\)
p(D) = 2p/25
Therefore, the energy and momentum of each particle after the decay are:
Particle B: E = 0.511 MeV, p = 3p/25
Particle C: E = 0.08 MeV, p = 2p/25
Particle D: E = 0.08 MeV, p = 2p/25
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What force(s)
might cause a car
to slow down?
Friction
Applying the brakes
Wind
All of the above
Which of the following must be
TRUE if a solution is to be
considered acidic?
A. [H^+] < [OH)
B. [H^+] > [OH ]
C. KW= [H^+] /[OH]
D. [H^+] =[OH)
Answer:
c
Explanation:
kw=h+bls
(c) Explain your answers in A student mixed equal volumes of Ethanol and butanoic acid. He added a few drops of concentrated Sulphuric (VI) acid and warmed the mixture (i) Name and write the formula of the main products Name... Formula.. (ii) Which homologous series does the product named in (i) above belong? ***PLEASE HELP IT'S HOMEWORK
Answer:
Products: Ethyl butanoate + Water ||| C6H12O2 + H2O
This Compound is an Ester
Explanation:
So I assume that this question is an esterification question for a few reasons.
1. Since there is a Carboxylic acid and Alcohol reacting, it automatically means that it is esterification.
2. Sulphuric Acid is used as a catalyst so it won't affect this question in any way.
* Water is formed since you'd remove H from the Alcohol's Hydroxyl group, and when you remove an OH from the carboxyl group in the carboxylic acid.
Hopefully, this helped but since I don't have much context, I had to assume that you are doing Chemistry 30, Organic Chemistry.
A certain gas has a volume of 195 mL at 20°C and 1.00 atm. What is the its volume in mL at60°C and 600 mm Hg?
To solve this question we will assume that the moles of gas do not change and that the gas behaves like an ideal gas.
For an ideal gas we have that its behavior will be according to the following equation:
\(PV=nRT\)Where,
P is the pressure of the gas, in atm
V is the volume of the gas, in liters
n are the moles of the gas
T is the temperature of the gas, in Kelvin
R is a constant, 0.08206 atm.L/mol.K
We have for this gas two states, an initial state (1) and a final state (2), so for each state we can apply the ideal gas law, we will have:
Initial state:
\(\begin{gathered} P_1V_1=nRT_1 \\ nR=\frac{P_1V_1}{T_1} \end{gathered}\)Final state:
\(\begin{gathered} P_2V_2=nR_T_2 \\ nR=\frac{P_2V_2}{T_2} \end{gathered}\)Since nR are constants, we can equate both equations:
\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)For each state the conditions of pressure, volume and temperature will be:
P1=1.00atm
V1=195mL = 0.195L
T1=20°c = 293.15K
P2= 600mmHg=0.79atm
T2=60°C=333.15K
V2=Unknown
We clear V2 and replace the known data:
\(V_2=\frac{P_1V_1}{T_1}\times\frac{T_2}{P_2}\)\(\begin{gathered} V_2=\frac{1atm\times0.195L}{293.15K}\times\frac{333.15K}{0.79atm} \\ V_2=\frac{1\times0.195\times333.15}{293.15\times0.79}L \\ V_2=0.280L=280mL \end{gathered}\)Answer: The final volume of the gas will be 280mL
Which 10-milliliter sample of water has the greatest degree of disorder?A)H2O(g) at 120°CB)H2O() at 80°CC)H2O() at 20°CD)H2O(s) at 0°C
Answer:
A) H₂O at 120°C
Explanation:
It is possible to think the higher temperature, the greatest degree of disorder. That is because with a high temperature, vibrations of molecules increases.
In general, at low temperatures, the molecules are in solid state (The lowest degree of disorder), increasing its temperature, molecules becomes in liquids, and, with more temperature, are gases (The greatest degree of disorder).
Thus, the sample that has the greatest degree of disorder is:
A) H₂O at 120°CAnswer:
A) H2O(g) at 120c
Explanation:
Castle learning
Which action would increase the reaction rate of a chemical reaction in aqueous solution?
O adding excess cold water
O cooling the reaction mixture
O increasing the surface area of reactants
O removing a catalyst
Three students were asked to weigh 3.5 g of NaCl. The recorded readings were 3.4 g, 3.6 g, and 3.3 g. How can these readings BEST be interpreted? + or - 0.3 g is considered the range for precise measurements in this instance.
A. not accurate and not precise
B. not accurate but precise
C. accurate and precise
D. accurate but not precise
The reading from the three students can best be interpreted as not accurate but precise.
What are accuracy and precision?In measurements, accuracy is described as the closeness of a single or average measurement to the true value of what is measured.
On the other hand, the precision of measurements refers to the closeness of repeated measurements to each other.
Now, let us look at the readings from the three students.
The range of the reading can be calculated as:
3.6 - 3.3 = 0.3
Since a range of + or -0.3 is considered to be precise, the readings from the students is said to be precise.
Let us look at the average of the readings:
3.3 + 3.4 + 3.6/3 = 3.4 g
Since the actual weight of the salt is 3.5 g, the reading from the student is said to be inaccurate.
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(part 1 of 2)
Hydrogen and oxygen react under a specific
set of conditions to produce water according
to the equation
2 H2(g) + O2(g) −→ 2 H2O(g).
How much hydrogen would be required to
produce 7.5 mol of water?
Answer in units of mol. Answer in units of
mol.
(part 2 of 2)
How much oxygen would be required?
Answer in units of mol. Answer in units of
mol.
Answer: part 1 of 2
1. The amount required of H₂ = 11.0 g.
2. The amount required of O₂ = 88.0 g.
Explanation:
The balanced equation for the mentioned reaction is:
2H₂(g) + O₂(g) → 2H₂O,
It is clear that 2.0 moles of H₂ react with 1.0 mole of O₂ to produce 2.0 moles of H₂O.
Q1: How much hydrogen would be required to produce 5.5 mol of water?
Using cross multiplication:
2.0 mol of H₂ produce → 2.0 mol of H₂O, from stichiometry.
??? mol of H₂ produce → 5.5 mol of H₂O.
∴ the no. of moles of H₂ needed to produce 5.5 mol of water = (2.0 mol)(5.5 mol)/(2.0 mol) = 5.5 mol.
Now, we can get the mass of H₂ needed to to produce 5.5 mol of water:
mass of H₂ = (no. of moles)(molar mass) = (5.5 mol)(2.0 g/mol) = 11.0 g.
Q2: How much oxygen would be required?
Using cross multiplication:
1.0 mol of O₂ produce → 2.0 mol of H₂O, from stichiometry.
??? mol of O₂ produce → 5.5 mol of H₂O.
∴ the no. of moles of O₂ needed to produce 5.5 mol of water = (1.0 mol)(5.5 mol)/(2.0 mol) = 2.75 mol.
Now, we can get the mass of O₂ needed to to produce 5.5 mol of water:
mass of O₂ = (no. of moles)(molar mass) = (2.75 mol)(32.0 g/mol) = 88.0 g.
How to Balance half equations
Half-cell equations are balanced by adding appropriate coefficients, and hydrogen or hydroxyl ions on each side of the equations.
Balancing half equationsBalancing half-equations involves ensuring that the number of electrons lost during oxidation (written on the left-hand side of the half-equation) is equal to the number of electrons gained during reduction (written on the right-hand side of the half-equation).
This can be achieved by adding appropriate coefficients and/or H+ or OH- ions to balance the charges and number of atoms on each side.
Once both half-equations are balanced, they are combined to form a balanced overall equation for the redox reaction.
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|x-8|=3x
whats the solution for x
Selective serotonin reuptake inhibitors and tricyclic antidepressants (tcas) both function by which mechanism?
Selective serotonin reuptake inhibitors (SSRIs) and TCAs both increase the levels of neurotransmitters in the brain to improve mood and alleviate symptoms of depression, but they differ in their selectivity and side effect profiles.
Selective serotonin reuptake inhibitors (SSRIs) and tricyclic antidepressants (TCAs) both function by affecting the levels of certain neurotransmitters in the brain to alleviate symptoms of depression.
SSRIs, such as fluoxetine and sertraline, work by selectively inhibiting the reuptake of serotonin, a neurotransmitter involved in mood regulation. By blocking the reuptake process, SSRIs increase the concentration of serotonin in the synaptic cleft, enhancing its transmission and improving mood.
On the other hand, TCAs, like amitriptyline and imipramine, inhibit the reuptake of not only serotonin but also other neurotransmitters like norepinephrine. By blocking the reuptake of these neurotransmitters, TCAs increase their availability in the synaptic cleft, which can help regulate mood and alleviate depressive symptoms.
While both SSRIs and TCAs have similar mechanisms of action in terms of inhibiting the reuptake of neurotransmitters, they differ in their selectivity and side effect profiles. SSRIs are generally preferred due to their relatively fewer side effects and better tolerability.
In summary, SSRIs and TCAs both increase the levels of neurotransmitters in the brain to improve mood and alleviate symptoms of depression, but they differ in their selectivity and side effect profiles.
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You are conducting an experiment in science class. You fill Beaker 1 with 75 mL of water. You fill beaker 2 with 25 mL of water. They both are at the same temperature.
Which one has more thermal energy and why?
The Beaker of water that has more thermal energy is Beaker 1.
How to find the beaker with more thermal energy ?The total energy of all the particles is known as thermal energy. This implies that larger objects with slower-moving particles and lower temperatures can have more energy than smaller ones with higher temperatures (faster moving particles).
The amount of material in a sample of matter is measured by mass, hence the thermal energy is a function of the measured object's mass and temperature. An object's mass determines how many particles it contains and how much thermal energy it has at a given temperature.
For this reason, Beaker 1 which had more water, will have more thermal energy.
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Xenon forms several compounds with oxygen and fluorine. It is the most reactive non-radioactive noble gas because a. Its large radius allows oxygen and fluorine to bond without being crowded. B. It has the highest electronegativity of these noble gases. C. It has the highest electron affinity of these noble gases. D. Its effective nuclear charge is lower than the other noble gases. E. It has the lowest ionization energy of these noble gases
Xenon is the most reactive non-radioactive noble gas because it has the lowest ionization energy among the noble gases.
This means that it requires the least amount of energy to remove an electron from a xenon atom, making it more likely to form chemical bonds with other elements, such as oxygen and fluorine.
Xenon also has a relatively large atomic radius, which allows oxygen and fluorine atoms to bond with it without being too crowded. This is important because the noble gases typically do not form chemical bonds with other elements due to their stable electron configurations and small atomic radii.
Additionally, xenon has a higher electronegativity and electron affinity compared to other noble gases, which also contributes to its reactivity. Electronegativity refers to an atom's ability to attract electrons, while electron affinity refers to an atom's tendency to accept electrons. Both of these properties can make an atom more likely to form chemical bonds with other elements.
Overall, the combination of xenon's low ionization energy, large atomic radius, high electronegativity, and electron affinity make it a relatively reactive noble gas, capable of forming compounds with oxygen and fluorine.
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Pb + Fe(SO4) =Pb(SO4) + Fe what type of reaction is this ?
Answer:
Single replacement
Explanation: