Calculate the percentage, by mass, of fluorine in sulfur hexafluoride (SF6), a potent greenhouse gas.
A) 78.0%
B) 59.2%
C) 22.0%
D) 82.1%
E) 85.7%
Answers
The percentage, by mass, of fluorine in sulfur hexafluoride (SF6), a potent greenhouse gas is 13.008%.
HOW TO CALCULATE PERCENTAGE BY MASS:The percentage by mass of an element in a compound can be calculated by dividing the atomic mass of the element by the compound, multiplied by 100.
According to this question, the percentage by mass of fluorine (F) in sulfur hexafluoride (SF6) is to be calculated as follows:
Molar mass of SF6 = 146.06g/molAtomic mass of F = 19g/mol% mass of F = 19/146.06 × 100
% mass of F = 13.008%
Therefore, the percentage, by mass, of fluorine in sulfur hexafluoride (SF6), a potent greenhouse gas is 13.008%.
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Related Questions
It takes 83mL of a 0.45M NaOH solution to neutralize 235mL of an HCl solution.
What is the concentration of HCl solution?
Answers
Answer:
\(M_{acid}=0.16M\)
Explanation:
Hello there!
In this case, according to the reaction between hydrochloric acid and sodium hydroxide:
\(HCl+NaOH\rightarrow NaCl+H_2O\)
Whereas the 1:1 mole ratio of the acid to base allows us to write:
\(n_{acid}=n_{base}\)
At the equivalence point (complete neutralization); it is possible for us to write it in terms of molarities and volumes as follows:
\(M_{acid}V_{acid}=M_{base}V_{base}\)
In such a way, we solve for the molarity of the HCl to obtain:
\(M_{acid}=\frac{M_{base}V_{base}}{V_{acid}} \\\\M_{acid}=\frac{83mL*0.45M}{235mL}\\\\M_{acid}=0.16M\)
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A reaction vessel is filled with 4.04 g of hydrogen gas and 16.0 g of oxygen gas, and the mixture
explodes. Identify the limiting reactant and deduce the mass of water produced. Show all your
calculations to support your answer.
Balanced Equation: 2H2 + O2 = 2H2O
Answers
The limiting reactant is hydrogen. The mass of water produced is 18.02g.
What is limiting reactant?The limiting reactant in a chemical reaction determines the amount of product formed.
Balance equation is: 2H₂(g) + 1O₂(g) → 2H₂O(l)
Find the moles for each of the reactants, n = m/M
n(H₂) = 4.04g / 2.02 g/mol= 2.00mol
n(O2) = 16.00g / 32.00 g/mol = 0.05mol
Molar mass of water is (2 x 1.01) + (16) = 18.02 g/mol
The ratio is 1:2 ,i.e. one mole of O₂ will produce twice as many moles of water. Therefore, multiply the amount of moles for O₂ by two
n (O₂) = 0.05mol * 2 = 1mol
The mass of water produced,
m(H2O) = 1mol * 18.02g/mol = 18.02g
Thus, 18.02g is the mass of water produced.
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If the boiling point elevation of an aqueous solution containing a non-
volatile electrolyte is 1.02° C, what is the molality of the solution?
Answers
Answer:
Molality of the solution is 1.9922 m.
Explanation:
The boiling point elevation (ΔTb) of a solution can be calculated using the following formula:
ΔTb = Kb x molality
∴ Kb is the ebullioscopic constant of the solvent (water in this case) and molality is the molality of the solution.
For water, Kb = 0.512 °C/m.
From the problem statement, ΔTb = 1.02 °C. Plugging these values into the equation above, we get:
1.02 °C = 0.512 °C/m x molality
Solving for molality, we get:
molality = 1.02 °C / (0.512 °C/m) = 1.9922 m
Therefore, the molality of the solution is 1.9922 m.
Part A Indicate whether aqueous solutions of each of the following will contain only ions, only molecules, or mostly molecules and a few ions.
Answers
Aqueous solutions can contain ions, molecules, or a combination of both depending on the substances dissolved in the water.
1. If the solute is an ionic compound that dissociates in water, the solution will contain ions. For example, when table salt (NaCl) is dissolved in water, it dissociates into sodium ions (Na+) and chloride ions (Cl-). In this case, the solution will only contain ions.
2. If the solute is a covalent compound that does not dissociate in water, the solution will contain only molecules. For instance, when sugar (C12H22O11) is dissolved in water, the sugar molecules do not dissociate into ions. Therefore, the solution will only contain molecules.
3. Some compounds can partially dissociate in water, resulting in a mixture of ions and molecules. This occurs when a weak acid or base is dissolved in water. An example is acetic acid (CH3COOH), which partially dissociates into acetate ions (CH3COO-) and hydrogen ions (H+). So, the solution will mostly contain molecules but also a few ions.
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Which statement describes a condensation reaction?
A. monomers break away when one forms a double bond monomers break away with the addition of a water molecule.
B. Two monomers combine when one adds to the double bond of another.
C. Two monomers form a new bond with the loss of a water molecule .
Answers
The statement that describes a CONDENSATION reaction is that two monomers form a new bond with the loss of a water molecule . That is option C.
CONDENSATION REACTION involves the combination of two or more molecules(monomers) of water. In reaction, a new bond is usually formed.
The characteristics of a condensation reaction includes:
formation of complex molecules (combination of two smaller monomers),water is usually given off as by product it requires a catalyst for a complete reaction to occurA reaction is called a condensation reaction because a small molecule such as water is released as a byproduct.
A typical example of a condensation reaction is the condensation of amino acids to form dipeptide. The −OH from the carboxyl group of one amino acid combines with a hydrogen atom from the amine group of the other amino acid to produce water.
Therefore, the statement that describes a CONDENSATION reaction is that two monomers form a new bond with the loss of a water molecule. That is option C
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A 10.0 g sample of a gas occupies 7.69 L at 1.00 atm and 27.0 C. The gas has been determined to be diatomic. What is the gas
Answers
ANSWER
EXPLANATION
Given that
The mass of the gas is 10.0g
The volume of the gas is 7.69L
The pressure of the gas is 1.00 atm
The temperature of the gas is 27 degrees Celcius
Follow the steps below to find the molar mass of the gas
Step1; Assume the gas is an ideal gas
\(\text{ Pv = nRT}\)Step 2; Find the number of mole of the gas using the equation above
\(\begin{gathered} \text{ T K = t}\degree C\text{ + 273.15} \\ \text{ T K = 27 + 273.15} \\ \text{ T K = 300.15K} \end{gathered}\)\(\begin{gathered} \text{ R is 0.0825 L.atm . K}^{-1}\text{ mol}^{-1} \\ \text{ 1 }\times\text{ 7.69 = n }\times\text{ 300.15 }\times\text{ 0.08205} \\ \text{ 7.69 = n24.627} \\ \text{ Divide both sides by 24.627} \\ \text{ n = }\frac{7.69}{24.627} \\ \text{ n = 0.312 moles} \end{gathered}\)Step 3; find the molar mass of the sample
\(\begin{gathered} \text{ mole = }\frac{\text{ mass}}{molar\text{ mass}} \\ \text{ cross multiply} \\ \text{ mass = mole x molar mass} \\ \text{ molar mass =}\frac{mass}{\text{ mole}} \\ \\ \text{ molar mass = }\frac{10}{0.312} \\ \text{ molar mass = 32.05} \end{gathered}\)How many moles is 1.5 x10 20?
Answers
2.49 x \(10^{-4}\) moles is equal to 1.5×\(10^{20}\). The number of moles is equal to the number of molecules divided by Avogadro's number, 6.022×\(10^{23}\).
This means that 1.5×\(10^{20}\)moles are equal to
1.5×\(10^{20}\)/6.022×\(10^{23}\)
0.24908×\(10^{-3}\)
2.49 x \(10^{-4}\) moles.
Avogadro's number: Avogadro's number is a constant used in chemistry to represent the number of atoms or molecules in a mole of a substance. It is equal to 6.022 x \(10^{23}\). Or we can say that Avogadro's number is, the number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 1023. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction.
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It’s says you have to prepare 250 mL of a solution A (H2SO4) that has a molal concentration of 0,2 m and this from an initial concentrated solution :
Concentration of the concentrated solution of H2SO4: 62% m/m (g/g)
Voluminous masse of H2SO4 concentrated: 1,52g/mL
Calculate the volume of the solution concentrated ( H2SO4) that is necessary
It’s a chemistry problem
Answers
Volume of concentrated solution = 250 mL * 0.2 molal/ (1.52 g/mL * 0.62 molal)= 33.76 mL
Dilution calculationThis is an example of a dilution calculation. To calculate the volume of the concentrated solution necessary to prepare 250 mL of a 0.2 m solution of H2SO4, we must use the formula: V1C1 = V2C2, where V1 is the volume of the concentrated solution, C1 is the concentration of the concentrated solution, V2 is the desired volume of the diluted solution, and C2 is the concentration of the diluted solution.In this case, V1 = ?, C1 = 62% m/m (g/g), V2 = 250 mL, and C2 = 0.2 m. Rearranging the equation, we get V1 = V2C2/C1, or V1 = 250 mL x 0.2 m / 62% m/m (g/g).Since 1 mL of the concentrated solution has a mass of 1.52 g, the volume of the concentrated solution necessary is V1 = (250 mL x 0.2 m) / (62% m/m x 1.52 g/mL) = 7.18 mL.Therefore, 7.18 mL of the concentrated solution is necessary to prepare 250 mL of a 0.2 m solution of H2SO4.To learn more about dilution calculation refer to:
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Select Copper(1) oxide, Cu₂O. Note that CużO is a compound composed of different types of atoms bonded together. Place the CużO molecule on the nano-balance.
A. What is the molecular mass of Cu2O?
B. Add molecules to the larger balance until its reading matches that of the nano- balance exactly. How many molecules did you need to add?
C. Repeat the above procedure with another molecule of your choice. How many molecules did you need to add?
Answers
Copper monoxide is an ionic compound. The molar mass of copper oxide is 143 g/mol. In nanobalance, we need to add the Avogadro number of molecules.
What is Avogadro number?The number of atoms contained by one mole of every substance is called Avogadro number. It is equal to 6.02 × 10²³. Hence, one mole of every compound contains these much molecules.
Copper (I)oxide is an ionic compound formed through electrons shared form copper metal to oxygen atom.
Atomic mass of copper = 63.5 g/mol
Atomic mass of oxygen = 16 g/mol
molar mass of copper oxide = (63.5 × 2) + 16 =143 g/mol
We need to Avogadro number of molecules or one mole of the compound into nano - balance to balance it exactly. Thus, 6.02 × 10²³ molecules.
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5. An object is a regular, rectangular, solid with dimensions of 2 cm by 3cm by 2cm. It has a mass of 24 g. find its density.
Answers
Answer:
Density, D = 2g/cm^3
Explanation:
Given the following data;
Length = 2cm
Width = 3cm
Height = 2cm
Mass = 24g
Density = ?
Volume of a rectangular solid (V) = Length × Weight × Height
Therefore, V = L× W × H
Substituting the values, we have;
\(V = 2 *3 * 2 = 12\)
V = 12cm
Density can be defined as the ratio of mass to volume i.e mass all over volume.
Mathematically, \(Density = \frac{Mass}{Volume}\)
\(D = \frac{M}{V}\)
Substituting the values, we have;
\(D = \frac{24}{12}\)
Density, D = 2g/cm^3
Hence, the density of the rectangular solid is 2g/cm^3.
Which of the following is an expression of Charles's law?
Answers
Answer:
C.
Explanation:
V/T=constant
An aqueous solution of ________ will produce a neutral solution.
Answers
The aqueous solution of a salt formed by a strong acid and a strong base will produce a neutral solution.
The aqueous solution of a salt formed by a strong acid and a strong base will produce a neutral solution. The pH value of this solution is 7. A strong acid is an acid that ionizes completely in aqueous solution, whereas a strong base is a base that ionizes completely in aqueous solution.
A salt can be formed by reacting an acid and a base. Depending on the strength of the acid and base involved in the reaction, the salt may be acidic, basic, or neutral in nature. If the acid is strong and the base is weak, the salt formed will be acidic. If the acid is weak and the base is strong, the salt formed will be basic. If both the acid and base are strong, the salt formed will be neutral.
The pH value of a neutral solution is 7. The pH scale ranges from 0 to 14, with values below 7 being acidic and values above 7 being basic. A neutral solution has an equal concentration of hydrogen ions and hydroxide ions. Hence, it is neither acidic nor basic.
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Write a simple procedure for measuring out 2.6 grams of sodium bicarbonate NaHCO3 or commonly known as baking soda?
PLEASE I REALLY NEED THIS!!! :/
Answers
Answer:
See explanation
Explanation:
If I intend to measure 2.6 g of sodium bicarbonate, I need a spatula, a filter paper, and a weighing balance.
The filter paper is placed on the balance and the balance is adjusted to read zero. The spatula is now used to collect the sodium bicarbonate solid from its container and gradually drop it on the filter paper while watching the mass read out by the balance. This continues until the balance reads 2.6g.
plz choses one of the answer choices
Answers
Answer:
B
Explanation:
It adds so there are 4 aluminum on both sides as well as 6 oxygen on both sided.
Answer:
B. would be the correct option.
Explanation:
To balance the equation, both the reactant and product must have the same number so with 4Al+30 with two on the bottom, you would get a total of 4 Al atoms and 6 O atoms. Now, the other side must have 4 Al atoms and 6 O atoms, so multiply them by 2 and that would be your answer.
Write the chemical formula for magnesium nitrate hexahydrate
Answers
Answer: Mg(NO₃)₂ * 6 H₂O
Explanation:
which response includes all the molecules below that do not follow the octet rule? (1) h2s (2) bcl3 (3) ph3 (4) sf4
Answers
BCl3 and SF4 response includes all the molecules below that do not follow the octet rule.
Why is the octet rule important?The principle of eight, electromagnetic theory of valence, and octet philosophy of valence are other names for the octet rule. According to the octet theory, atoms interact with one another during the creation of chemical bonds by giving up, acquiring, or sharing electrons. They do develop an eight-electron stable outermost shell.
What substances follow the octet rule?The primary group elements, such as oxygen, carbon, and nitrogen, follow octet laws. Except for lithium, hydrogen, and helium, all s-block & p-block elements adhere to the octet rule. Too few electrons exist in hydrogen, helium, and boron for them to form an octet. Since hydrogen only has one valence electron, it can only establish bonds with other atoms in one location.
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What is the mass percent of nitrogen in NH4Cl?
Answers
Answer:
Explanation:I believe the mass percent of nitrogen in NH4Cl N H 4 C l is 26.19%. I might be right but I had this same question on my eoc
Answer:
So, 53.49 g (M) of NH4Cl N H 4 C l contains 14.01 g (m) of N . So, the mass percent of nitrogen in NH4Cl N H 4 C l is 26.19%.
Explanation:
the answer is 26.19%
WHAT IS NH4CH
It was reborn in the united states people used it for equants
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Molar mass calculation for Cl^2
Answers
Answer:
Mass of Cl = 35.5
Mass of Cl2 => 35.5×2
=> 71 g/mol
hope that helps ✌
71
explain:The atomic mass of chlorine is equal to the molar mass of chlorine so the molar mass of chlorine is 35.5
=> molar mass for Cl^2: 35,5*2=71
What kind of molecule can experience hydrogen bonding?
A. A nonpolar molecule containing a hydrogen atom
B. A molecule with hydrogen bonded to any nonmetal
C. A molecule with hydrogen bonded to O, N, or F
D. Any polar molecule containing a hydrogen atom
Answers
Answer:
Answer is C
Explanation:
C - A molecule with hydrogen bonded to O, N, or F
A molecule with hydrogen bonded to O, N, or F can experience hydrogen bonding. Therefore, the correct option is option C.
A hydrogen atom is attracted to another electronegative atom in a neighbouring molecule when it is connected to a strongly electronegative atom (O, N, or F). This attraction is more powerful than the usual dipole-dipole interactions between polar molecules.
The enormous electronegativity differential between hydrogen and the highly electronegative atom causes hydrogen bonding. The electronegative atom attracts the shared electrons in the covalent link, causing the hydrogen atom to gain a partial positive charge.
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Electrons are subatomic particles that exist
Answers
How many carbon atoms are represented in the formula for CaMg3(CO3)4
Answers
Answer : There are 4 Carbon atoms in the formula.
Which of the following is the main cause of acid rain?
water vapor
photosynthesis
ozone depletion
smog
Answers
Answer:
photosynthesis
Explanation:
Answer:
Photosynthesis
Explanation:
I had it on a quiz.
How many grams of sucrose, c12h22o11, a nonvolatile, nonelectrolyte (mw = 342.3 g/mol), must be added to 299.7 grams of water to reduce the vapor pressure to 23.10 mm hg ?
Answers
To solve this problem, we can use Raoult's law, which states that the vapor pressure of a solution is proportional to the mole fraction of the solvent in the solution. In other words, \(P_solvent = X_solvent * P°_solvent\)
mass of sucrose comes to be 9.11 g
Since sucrose is a nonvolatile solute, its vapor pressure is negligible and can be assumed to be zero. Therefore, we can use the following equation to calculate the mole fraction of water:\(X_water = P_water / P°_water\)
where \(P_water\) is the vapor pressure of water in the solution and \(P°_water\) is the vapor pressure of pure water. We can rearrange this equation to solve for \(P_water\): \(P_water = X_water * P°_water\)
Now we can use the given information to solve for X_water:
\(P_water = 23.10 mmHgP°_water = 760 mmHgX_water = P_water / P°_water = 0.0304\)This means that the mole fraction of sucrose in the solution is:
\(X_sucrose = 1 - X_water = 0.9696\), To find the mass of sucrose needed, we can use the following equation \(mass_sucrose = X_sucrose * mass_solution * (1 / mw_sucrose)\) where mass_solution is the total mass of the solution (water + sucrose) and mw_sucrose is the molar mass of sucrose.
Substituting the given values: = \(0.9696 * (299.7 g + mass_sucrose) * (1 / 342.3 g/mol)\)
Simplifying and solving for mass of sucrose = 9.11 g. Therefore, 9.11 grams of sucrose must be added to 299.7 grams of water to reduce the vapor pressure to 23.10 mmHg.
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If I start the following reaction with 5 moles of oxygen how many moles of MgO will be produced?
Answers
We will produce 6 moles of magnesium oxide
What does a mole with cancer look like?a rough border Typically, the edges are jagged, scalloped, or fuzzy in appearance. The nearby skin may be covered by the pigment. erratic color: There could be shades of tan, brown, and black. It's also possible to have patches of white, black, red, pink, or blue color.
If we have 6 moles of magnesium, then we use the ratios from the balanced equation to find the moles of oxygen needed
MOLES O₂ = MOLES MG * (1 O₂ / 2 Mg) <--- we get this from equation
= 6 mol Mg * (1 O₂ / 2 Mg)
= 3 mol O₂
We need 3 moles of oxygen otherwise we will not have all 6 moles of magnesium react. This will product
MOLES MgO = MOLES MG * (2 MgO / 2 Mg)
= 6 mol Mg * (2 MgO / 2 Mg)
= 6 mol MgO
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Iron(III) hydroxide undergoes thermal decomposition to form iron(III) oxide and
water.
Calculate the mass of Fe₂O3 formed from the decomposition of 17.2g of Fe(OH)3,
assuming a 40% yield. Give your answer to 3 significant figures.
2Fe(OH)3(s)
Fe₂O3(s)
+
3H₂O(g)
[4 marks]
Answers
The mass of Fe₂O₃ formed from the decomposition of 17.2g of Fe(OH)₃ , with yield assuming to be 40% is 5.14 g (upto three significant figures).
The reaction in which one reactant breaks down to form two or more different products is known as decomposition reaction.
The decomposition reaction of Fe(OH)₃ takes place as:
2Fe(OH)₃ (s) → Fe₂O₃(s) + 3H₂O(g)
Firstly, we will find out the relative formula mass of Fe(OH)₃ and Fe₂O₃.
The sum of the relative atomic masses of atoms present in a molecule is known as the relative formula mass of that molecule.
Relative formula mass of Fe(OH)₃
= ( 56+ 16×3+1×3)g
=(56+48+3)g
=107g
Relative formula mass of Fe₂O₃
=(56×2+16×3)g
=(112+48)g
=160g
From the equation we get,
2 × 107g Fe(OH)₃ gives= 160g Fe₂O₃
∴ 17.2g Fe(OH)₃ will give
= (160×17.2)/(2×107) g Fe₂O₃
=12.85 g Fe₂O₃
And, 40% yield
= 40/100 × 12.85
=5.14 g
Hence, assuming 40% yield, the mass of Fe₂O₃ formed from the decomposition of 17.2g of Fe(OH)₃ is 5.14 g
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Which of the following is most critical for maintaining the native tertiary structure of a globular protein? Hydrogen bonds between regions of the polypeptide chain in the folded protein The hydrophobic effect of burying non-polar residues in the protein interior. Disulfide bonds between Cys residues in the protein. Salt bridges (i.e. ionic bonds between opposite charged side chains). None of these choices.
Answers
Among the given options, hydrogen bonds between regions of the polypeptide chain are the most critical for maintaining the native tertiary structure of a globular protein. They provide specific and directional interactions, contributing significantly to the stability of the folded protein.
The most critical factor for maintaining the native tertiary structure of a globular protein is the hydrogen bonds between regions of the polypeptide chain in the folded protein. Here's why:
1. Hydrogen bonds are formed between the electronegative atoms, typically oxygen or nitrogen, and hydrogen atoms in the protein. They contribute to the stabilization of the folded structure by providing specific and directional interactions between different regions of the polypeptide chain.
2. The hydrophobic effect, which involves the burying of non-polar residues in the protein interior, is important for stabilizing the protein's overall structure, but it does not directly contribute to maintaining the native tertiary structure.
3. Disulfide bonds between cysteine (Cys) residues can form covalent bonds and play a critical role in stabilizing the tertiary structure of some proteins, especially those found in extracellular environments. However, not all proteins have disulfide bonds, and the absence of disulfide bonds does not necessarily lead to loss of the native tertiary structure.
4. Salt bridges, also known as ionic bonds, occur between oppositely charged side chains and contribute to the stabilization of protein structure. While they can play a role in maintaining the structure, they are generally less critical compared to hydrogen bonds.
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If you have a liquid that you suspect might be a mixture explain what you might do to find out if it is.
Answers
Answer:
add a substace devider
Explanation:
i forgot what it was called but there is a chemical that allows the substances to seperste and than you can test the substaces ph and what it is
Calculate the energy required to heat 712.0 g of graphite from 2.0 °C to 20.7 °C. Assume the specific heat capacity of graphite under these conditions is 0.710 J-g-K Round your answer to 3 significant digits.
Answers
To calculate the energy required to heat a substance, we can use the formula:
Q = mcΔT
where Q is the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.
Given that we have 712.0 g of graphite, a specific heat capacity of 0.710 J/g-K, and a temperature change of 18.7 °C (20.7 °C - 2.0 °C)
Q = (712.0 g) x (0.710 J/g-K) x (18.7 °C)
Q = 10,965.64 J.
The energy required to heat 712.0 g of graphite from 2.0 °C to 20.7 °C is 10.965 kJ.
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When a Lewis acid and a Lewis base combine, the product may be referred to as : None of the options.
Adduct Bronsted Base Anode Bronsted Acid
Answers
When a Lewis acid and a Lewis base combine, the product may be referred to as an adduct.
An adduct is a chemical species that is formed when a Lewis acid and a Lewis base combine through a coordinate covalent bond. In this reaction, the Lewis base donates a pair of electrons to the Lewis acid, which accepts the electrons. This results in the formation of a new molecule, called an adduct, which contains a new covalent bond.
An example of an adduct is the reaction between boron trifluoride (BF3) and ammonia (NH3) to form boron trifluoride ammonia complex (BF3•NH3), which is an adduct.
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If a five-cent coin is made of 25% copper and 75% Nickel, determine the mass of Nickel and Copper in the coin.
Answers
Answer:
3.75g of Ni and 1.25g of Cu
Explanation:
The five-cent coin of Unit States has a mass of 5.000g. To find the mass of each atom we have to multiply the total mass times the percentage of each atom (Nickel and Copper). That is:
Mass Nickel:
5.000g * 75% = 3.75g of Ni
Mass Copper:
5.000g * 25% = 1.25g of Cu