What is the Molality of a solution in which
25 g of sodium chloride is dissolved in 2.0
kg of water?

Answer:

B

Explanation:

B is a personal factor of resilience

The molarity of the solution containing 0.05 g of KCl in a total volume of 0.310 L is approximately 0.0022 M.

To determine the molarity of a solution, we need to know the moles of solute and the volume of the solution. First, we need to convert the mass of KCl to moles using its molar mass. The molar mass of KCl is approximately 74.55 g/mol (39.10 g/mol for potassium + 35.45 g/mol for chlorine).

Using the formula:

moles = mass / molar mass

moles = 0.05 g / 74.55 g/mol = 0.00067 mol

Next, we convert the total volume of the solution to liters:

0.310 L

Finally, we calculate the molarity (M) using the formula:

Molarity = moles of solute / volume of solution (in liters)

Molarity = 0.00067 mol / 0.310 L ≈ 0.0022 M

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1. Water begins to boil - Endothermic

2. Fireworks explode - Exothermic

3. Sweat evaporates cooling your skin - Endothermic

4. Water begins to freeze into ice - Exothermic

5. You ignite your homework assignments once the year is over - Exothermic

6.Sunrays burn your skin - Exothermic

7.Cellular respiration - Exothermic

Exothermic and endothermic refer to two types of chemical reactions or physical processes that release or absorb energy, respectively.

Exothermic reactions release energy in the form of heat, light, or sound. When these reactions occur, they produce a net release of energy into the surroundings, which can often be felt as an increase in temperature. Examples of exothermic reactions include combustion, oxidation, and many types of explosions.

Endothermic reactions, on the other hand, absorb energy from the surroundings in order to proceed. These reactions typically feel cold to the touch and require energy to be added to the system in order to occur. Examples of endothermic reactions include melting, evaporation, and many types of chemical reactions that require heat to be added in order to proceed.

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Answer:

Molarity =[ number of moles* (1000mL/L)] / volume in mL

Explanation:

Given: Molarity =1.5M, volume = 100mL

1.5 =[ (no. of moles) * (1000mL/L) / 100mL

no of moles = (1.5* 100) / 1000

no of moles = 0.15

We know that, 1 mole = 6.023 *10²³ atoms

Since the compound contains 0.15moles, it has

0.15 * 6.023* 110²³

9.0345*10²² atoms of carbon are present in the compound.

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Answer:

B. a difference in temperatures.

Explanation:

Conduction involves the transfer of electric charge or thermal energy due to the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.

In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles.

Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.

In order for heat to flow there must be a difference in temperatures.

This ultimately implies that, the driving force responsible for heat to flow is a difference in temperature between the points from which heat originates and where heat is received.

Additionally, the higher the temperature difference, the greater would be the heat flow; which is usually from a high temperature level to a low temperature level.

Answer:

Rb, Zn, P, S, F, Ca, Co, Cr

Rb, Zn, P, S, F, Ca, Co, Cr elements in order of decreasing metallic character.

The metallic character of an element is defined as the properties typical of metal, especially the tendency to lose electrons in chemical reactions.

Metallic character depends on the ability of an element to lose its outer valence electrons. Examples of properties related to metallic character include thermal and electrical conductivity, metallic lustre, hardness, ductility, and malleability. The most "metallic" element is francium, followed by caesium.

Hence, Rb, Zn, P, S, F, Ca, Co, and Cr elements in order of decreasing metallic character.

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Answer

1. Acetic acid + Sodium hydroxide → Sodium Acetate + Water

2. CH₃COOH + NaOH → CH₃COONa + H₂O

3. CH₃COOH + OH⁻ → CH₃COO⁻ + H₂O

Explanation

1. The proper names of the products for the reaction between acetic acid and sodium hydroxide are given below (separated by a + sign).

Acetic acid + Sodium hydroxide → Sodium Acetate + Water

2. The full, balanced molecular equation with the correct chemical formulas, including coefficients is:

CH₃COOH + NaOH → CH₃COONa + H₂O

3. Finally, the net ionic equation for this reaction is below, including ionic charges.

Strong bases are considered strong electrolytes and will dissociate completely. This means that NaOH will split apart in the net ionic equation. Weak acids only dissociate partially and are not considered to split apart into ions when writing net ionic equations.

CH₃COOH + Na⁺ + OH⁻ → CH₃COO⁻ + Na⁺ + H₂O

Cross the spectator ions, we have:

CH₃COOH + OH⁻ → CH₃COO⁻ + H₂O

Caffeine - Lead (Pb) - Copper (II) chloride (CuCl2) - Sodium chloride (NaCl) - Silver (Ag) - Tungsten

Nonpolar covalent bonds are formed when electrons are shared equally between two atoms.

A non-polar covalent bond is a type of chemical bond that is formed when electrons are generally shared equally between two atoms. Thus, in an atom, the number of electrons shared by the adjacent atoms will be the same.

The covalent bond is also termed as nonpolar because the difference in electronegativity is mostly negligible or very less. It further means that there is no separation of charges between the two atoms or both the atoms have similar electronegativity. This type of bond is also formed when atoms that share a polar bond arrange themselves in such a manner where the electric charges tend to cancel each other out.

A non-polar covalent bond can occur between two identical non-metal atoms or between different atoms.

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1) List the known and unknown quantities.

Concentration: 16%(m/m).

Mass of solute: 10 g NaOH.

Mass of solvent: unknown.

2) Set the equation.

Mass percent.

3) Plug in the known values and solve for grams of solvent (water).

.

The 16%(m/m) solution contains 62.5 g H2O.

.

There are approximately 3.47 x 10²² molecules in 5.657g H₂SO₄.

To calculate the number of molecules in 5.657g H₂SO₄, we need to use the Avogadro's number and the molar mass of H₂SO₄.

The molar mass of H₂SO₄ is 98.079 g/mol.

We need to calculate the number of moles of H₂SO₄:

Number of moles = mass/molar mass

                             = 5.657g / 98.079 g/mol

                            = 0.05767 mol.

Then, we can use Avogadro's number, which is 6.022 x 10²³ molecules/mol, to find the number of molecules:

Number of molecules = number of moles x Avogadro's number

                                   = 0.05767 mol x 6.022 x 10²³ molecules/mol

                                    = 3.47 x 10²² molecules

To calculate the number of molecules in a given sample of a substance, you need to use the Avogadro's number, which is 6.022 x 10²³ molecules/mol. This means that one mole of a substance contains 6.022 x 10²³ molecules.

We are given the mass of H₂SO₄, which is 5.657 g. To calculate the number of molecules, we first need to determine the number of moles of H₂SO₄ in the given sample. The molar mass of H₂SO₄ is 98.08 g/mol. So, the number of moles of H₂SO₄ can be calculated as follows:

moles = mass / molar mass

moles = 5.657 g / 98.08 g/mol

moles = 0.0576 mol

Now, we can use the Avogadro's number to determine the number of molecules of H₂SO₄ in 0.0576 moles:

number of molecules = moles x Avogadro's number

number of molecules = 0.0576 mol x 6.022 x 10²³ molecules/mol

number of molecules = 3.47 x 10²² molecules

As a result, in 5.657 g of the material, there are roughly 3.47 x 1022 molecules of H₂SO₄.

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Answer:

1.52M in NaCl

Explanation:

Molarity = moles solute / volume solution in Liters

=> molarity (M) = 3.8 moles / 2.5 Liters solution = 1.52 molar solution in NaCl

Answer: 1.52

Explanation:

The pH of the solution in which one normal adult dose aspirin is dissolved is :  2.7

Given data :

mass of aspirin = 640 mg = 0.640 g

volume of water = 10 ounces = 0.295735 L

molar mass of aspirin = 180.16 g/mol

moles of aspirin = mass / molar mass = 0.00355 mol

First step : calculate the concentration of aspirin

= moles of Aspirin / volume of water

= 0.00355 / 0.295735

= 0.012 M

Given that pKa of Aspirin = 3.5

pKa = -logKa

therefore ; Ka = \(10^{-3.5}\) = \(3.162 * 10^{-4}\)

From the Ice table

\(3.162 * 10^{-4}\) = \(\frac{x + H^+}{[aspirin]}\)  = \(\frac{x^{2} }{0.012-x}\)

given that the value of Ka is small we will ignore -x

x² = \(3.162 * 10^{-4} * 0.012\)

x = \(1.948 * 10^{-3}\)  

Therefore

[ H⁺ ] = \(1.948 * 10^{-3}\)

given that

pH = - Log [ H⁺ ]

     = - ( -3 + log 1.948 )

     = 2.71 ≈ 2.7

Hence we can conclude that The pH of the solution in which one normal adult dose aspirin is dissolved is :  2.7

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Answer:

Answer::

Explanation::

Answer:

We will take the 0.5 L from the 1M stock solution of KF inorder to form 0.5 M KF of 1L.

Explanation:

Given data:

Final volume = 1L

Final molarity = 0.5 M

Initial molarity = 1 M

Initial volume = ?

Solution:

Formula:

M₁V₁ = M₂V₂

1 M × V₁ = 0.5 M ×1L

V₁ =  0.5 M ×1L  /1 M

V₁ = 0.5 L

We will take the 0.5 L from the 1M stock solution of KF inorder to form 0.5 M KF of 1L.

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1. Conduction : direct contact

2. Convection : hot & cold liquid motion

3. Radiation :  via electromagnetic waves & warm gas rising

1. Conduction: This has to do with the transfer of heat from one medium to another having direct contact with each other, the medium can either be solid or liquids

2. Convection: Has to do with the transfer of heat energy via molecules of the liquids in motion with different or varying temperature gradients

3. Radiation: Mostly occurs in gases, it is the transfer of energy through waves

To find the oxidation number we can check the periodic table of the elements. There are some elements that have only one oxidation state, others can have more than one.

We must take into account that the total oxidation state of the molecule must be 0, so the sum of the oxidation states of the elements must equal 0.

To start, let's identify the possible oxidation states of elements in molecules.

Pb: +4, +2

Cr: +6, +3, +2

Or: -2

Oxygen has only one oxidation state equal to -2 so we'll start by placing that. Regarding chromium, in this case, the only possibility is that it has an oxidation state of +6 since if the oxidation state is lower, the molecule could not be neutralized with a single Pb atom.

With an oxidation state of oxygen of -2, of Cr equal to +6, the lead must have an oxidation state of +4. To understand it we can see the following table:

Therefore, the answer will be:

p) Oxidation number of Pb in Pb(Cr2O7)2: +4

q) Oxidation number of Cr in Pb(Cr2O7)2: +6

r) Oxidation number of O in Pb(Cr2O7)2: -2

The quantity of NaOH required to reach the third equivalence point is 20mL.

Using the titration formula,

CaVa/CbVb = Na/Nb

Where,

Ca = concentration of citric acid (0.200 M)

Cb = concentration of NaOH (0.750 M)

Va = Volume of citric acid (25.0 mL)

Vb = volume of NaOH (x mL)

Na = number of reacting mole of citric acid (3)

Nb = number of reacting mole of NaOH (1)

Therefore Vb ( x mL) =CaVaNb/CbNa

 = 0.2× 25×3/0.75 ×1

= 15/0.75

                   Vb ( x mL) = 20 mL

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the answer is that it is a

Answer: The concentration(molarity) of the solution will be 1.35 X10-4 M

Explanation: Molarity is defined as number of moles of solute present in one litre of any solution.

Mathematically,

Molarity= no of moles of solute/volume of solution(in liters)

M=N/V(liters)

Also upon dilution the number of moles of the solution remain unchanged

Therefore initial no of moles(before dilution)= final no of moles(after dilution)

M1V1=M2V2

According to the question,

Molarity of Na2S04 before dilution(M1)=1.5 M

Volume of NA2SO4(V1)=45 mL

Molarity of Na2S04 after dilution(M2)=x M

Volume of Na2S04(V2)=500 mL

x=M1V1/V2

=1.5X45/500

=0.135 M =1.35 X10-4 M

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The one which Is not an electrophile in electrophilic aromatic substitution is the NH₃.

The electrophile are the species which are the electron deficient . this means that they are attracted to the one which is electron rich species. The electrophile will accepted the electron by the electron rich species and form the bond with the nucleophile. From the given option  the which Is not an electrophile in electrophilic aromatic substitution is the NH₃. as it contains the lone pair of electrons.  the nitrogen is more electronegative than the hydrogen. the nitrogen will get the partial negative charge.

Thus, the NH₃ act as a nucleophile and not a electrophile.

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Answer: When the metamorphic rock continues to heat up it will eventually melt creating molten rock. When it cools it will become igneous rock

Explanation:

:D

Answer:

As metamorphic rock continues to heat up, it can eventually melt and become molten/magma. When the molten rock cools it forms an igneous rock.

Explanation:

basically it need heat as hot as lava.

The Medal of Honor is the best navy decoration and highest volume.

The President of the USA The Victoria go is the holy grail for Medal of Honor creditors because there are the best in lifestyles. Bearing the inscription For valor and called a VC, this medal turned into first offered for conspicuous bravery' in 1856 and later backdated to the Crimean conflict of 1854. The outstanding service pass is the second maximum army ornament that may be provided to a member of the American military, for intense gallantry and risk of lifestyle in actual combat with an armed enemy force.

The Bronze Star Medal dates lower back to world battle II. these days, it is the fourth-maximum ranking award a provider member can obtain for a heroic and meritorious deed performed in an armed battle. For individuals who acquire the BSM, it's far a sign of their sacrifice, bravery, and honor at the same time as serving their us of a

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The number of moles of CO2 produced is 0.021 moles

If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.

The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).

The equation of the reaction is;

C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

We know that;

Number of moles of glucose = 10 g/180 g/mol

= 0.056 moles

PV = nRT

n = PV/RT

n = 1 * 0.55/318 * 0.082

n = 0.021

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we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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Answer:

Magnesium forms a positive ion and wants to lose electrons. Bromine forms a negative ion and wants to gain electrons.

Answer:

Magnesium forms a positive ion (Mg²+) and wants to lose two electrons.

Bromine forms a stable noble gas electronic

configuration when it gains one electron. Thus we find

magnesium as 2+ cation and bromine as a 1- anion in a

1:2 ratio in the compound .

Also, bromine forms a negative ion.