Question 1

The solubility of a gas in a liquid is greatest at ________ pressures and ________ temperatures.

Accepted Answer

The answer of The solubility of a gas in a...

Question 2

One reason ionic compounds do not dissolve well in nonpolar solvents is that

Accepted Answer

A) ion-dipole interactions are too large for effective solvation to occur. 
B) ion-solvent interactions are not strong enough to solvate the ions in solution. 
C) not all cations and anions have the same magnitude of charge and therefore do not form neutral ion pairs. 
D) there are no forces of attraction between ions and nonpolar molecules. 
A) ion-dipole interactions are too large for effective solvation to occur. 
B) ion-solvent interactions are not strong enough to solvate the ions in solution. 
C) not all cations and anions have the same magnitude of charge and therefore do not form neutral ion pairs. 
D) there are no forces of attraction between ions and nonpolar molecules.

Question 3

The solubility of gaseous solutes in liquid solvents is greater when the

Accepted Answer

A) external pressure over the solution is increased. 
B) external pressure is decreased. 
C) partial pressure of the gas above the solution is increased. 
D) partial pressure of the solvent is increased. 
A) external pressure over the solution is increased. 
B) external pressure is decreased. 
C) partial pressure of the gas above the solution is increased. 
D) partial pressure of the solvent is increased.

Question 4

A solution is prepared by dissolving 20.0 g of sucrose,C12H22O11,in 250.g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

Accepted Answer

A) 0.198 mm Hg 
B) 20.5 mm Hg 
C) 23.7 mm Hg 
D) 24.0 mm Hg 
A) 0.198 mm Hg 
B) 20.5 mm Hg 
C) 23.7 mm Hg 
D) 24.0 mm Hg

Question 5

The Henry's Law constant of methyl bromide,CH3Br,is k = 0.159 mol/(L ∙ atm)at 25°C.What is the solubility of methyl bromide in water at 25°C and at a partial pressure of 250.mm Hg?

Accepted Answer

A) 0.0523 mol/L 
B) 0.329 mol/L 
C) 0.483 mol/L 
D) 39.8 mol/L 
A) 0.0523 mol/L 
B) 0.329 mol/L 
C) 0.483 mol/L 
D) 39.8 mol/L

Question 6

What are the major solute-solvent interactions created when LiF dissolves in water?

Accepted Answer

A) dipole-ion 
B) dispersion 
C) hydrogen bonding 
D) ion-dipole 
A) dipole-ion 
B) dispersion 
C) hydrogen bonding 
D) ion-dipole

Question 7

Naproxen is a commercially important anti-inflammatory agent that can be isolated from the thyroid gland.A solution of 1.138 g of naproxen in 25.00 g benzene has an osmotic pressure of 4.00 atm at 20°C.The density of benzene is 0.8787 g/mL at this temperature.Calculate the molar mass of naproxen,assuming it remains intact upon dissolution and the density of the solution equals the density of pure benzene.

Accepted Answer

A) 176 g/mol 
B) 230 g/mol 
C) 307 g/mol 
D) 3.80 × 105 g/mol 
A) 176 g/mol 
B) 230 g/mol 
C) 307 g/mol 
D) 3.80 × 105 g/mol

Question 8

What is the mole fraction of ethanol in a solution made by dissolving 25.0 g of ethanol,C2H5OH,in 53.6 g of water?

Accepted Answer

A) 0.154 
B) 0.846 
C) 0.214 
D) 0.272 
A) 0.154 
B) 0.846 
C) 0.214 
D) 0.272

Question 9

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp =   and decane (bp = 126°C)is shown.  
-Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what is the liquid composition at the boiling point?

Accepted Answer

A) 100% decane 
B) composition at point b 
C) composition at point c 
D) composition at point e 
A) 100% decane 
B) composition at point b 
C) composition at point c 
D) composition at point e

Question 10

In which case should CO2(g)be more soluble in water?

Accepted Answer

A) The total pressure is 6 atm and the partial pressure of CO2 is 1 atm. 
B) The total pressure is 4 atm and the partial pressure of CO2 is 3 atm. 
C) The total pressure is 1 atm and the partial pressure of CO2 is 0.03 atm. 
D) The total pressure is 1 atm and the partial pressure of CO2 is 0.4 atm. 
A) The total pressure is 6 atm and the partial pressure of CO2 is 1 atm. 
B) The total pressure is 4 atm and the partial pressure of CO2 is 3 atm. 
C) The total pressure is 1 atm and the partial pressure of CO2 is 0.03 atm. 
D) The total pressure is 1 atm and the partial pressure of CO2 is 0.4 atm.

Question 11

To make a 0.125 M solution,one could take 0.125 moles of solute and add

Accepted Answer

A) 1.00 L of solvent. 
B) 1.00 kg of solvent. 
C) enough solvent to make 1.00 L of solution. 
D) enough solvent to make 1.00 kg of solution. 
A) 1.00 L of solvent. 
B) 1.00 kg of solvent. 
C) enough solvent to make 1.00 L of solution. 
D) enough solvent to make 1.00 kg of solution.

Question 12

At 25.0°C,a solution has a concentration of 3.179 M and a density of 1.260 g/mL.The density of the solution at 50.0°C is 1.249 g/mL.What is the molarity of the solution at 50.0°C?

Accepted Answer

A) 2.545 M 
B) 3.151 M 
C) 3.179 M 
D) 3.230 M 
A) 2.545 M 
B) 3.151 M 
C) 3.179 M 
D) 3.230 M

Question 13

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp =   and decane (bp = 126°C)is shown.  
-Assume that the vapor at point c is condensed and reboiled.What is the boiling point?

Accepted Answer

A) temperature at point b 
B) temperature at point c 
C) temperature at point d 
D) temperature at point f 
A) temperature at point b 
B) temperature at point c 
C) temperature at point d 
D) temperature at point f

Question 14

The solubility of argon in water at 25°C is 0.0150 mol/L.What is the Henry's Law constant for argon if the partial pressure of argon in air is 0.00934 atm?

Accepted Answer

A) 1.40 × 10-4 mol/(L ∙ atm) 
B) 0.623 mol/(L ∙ atm) 
C) 1.61 mol/(L ∙ atm) 
D) 4.10 mol/(L ∙ atm) 
A) 1.40 × 10-4 mol/(L ∙ atm) 
B) 0.623 mol/(L ∙ atm) 
C) 1.61 mol/(L ∙ atm) 
D) 4.10 mol/(L ∙ atm)

Question 15

A solution is 2.25% by weight NaHCO3.How many grams of NaHCO3 are in 250.0 g of solution?

Accepted Answer

A) 0.900 g 
B) 5.62 g 
C) 117 g 
D) 225 g 
A) 0.900 g 
B) 5.62 g 
C) 117 g 
D) 225 g

Question 16

What is the freezing point of a solution of 2.86 g MgCl2 in 100 g of water? Kf for water is 1.86°C/m.

Accepted Answer

A) -0.0558°C 
B) -0.558°C 
C) -1.12°C 
D) -1.67°C 
A) -0.0558°C 
B) -0.558°C 
C) -1.12°C 
D) -1.67°C

Question 17

________ properties depend only on the identity of the solute and on the number of solute particles present.

Accepted Answer

The answer of ________ properties depend only on the identity...

Question 18

Two aqueous solutions,A and B,are separated by a semipermeable membrane.The osmotic pressure of solution A immediately begins to decrease.Which of the following statements is true?

Accepted Answer

A) Solvent molecules are moving from solution B into solution A. 
B) The initial osmotic pressure of solution B is greater than that of solution A. 
C) The solvent molecules are moving from the solution of higher osmotic pressure to that of lower osmotic pressure. 
D) Both B and C are true statements. 
A) Solvent molecules are moving from solution B into solution A. 
B) The initial osmotic pressure of solution B is greater than that of solution A. 
C) The solvent molecules are moving from the solution of higher osmotic pressure to that of lower osmotic pressure. 
D) Both B and C are true statements.

Question 19

Which should be least soluble in water?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
A) 
  
B) 
  
C) 
  
D)

Question 20

Which of the following solutions will have the lowest freezing point?

Accepted Answer

A) 0.0100 m NaCl 
B) 0.0120 m Li2SO4 
C) 0.0400 m CH3CH2CH2OH 
D) 0.0150 m MgCl2 
A) 0.0100 m NaCl 
B) 0.0120 m Li2SO4 
C) 0.0400 m CH3CH2CH2OH 
D) 0.0150 m MgCl2

Exam 12: Solutions and Their Properties

The solubility of a gas in a liquid is greatest at ________ pressures and ________ temperatures.

One reason ionic compounds do not dissolve well in nonpolar solvents is that

The solubility of gaseous solutes in liquid solvents is greater when the

A solution is prepared by dissolving 20.0 g of sucrose,C12H22O11,in 250.g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

The Henry's Law constant of methyl bromide,CH3Br,is k = 0.159 mol/(L ∙ atm)at 25°C.What is the solubility of methyl bromide in water at 25°C and at a partial pressure of 250.mm Hg?

What are the major solute-solvent interactions created when LiF dissolves in water?

What is the mole fraction of ethanol in a solution made by dissolving 25.0 g of ethanol,C2H5OH,in 53.6 g of water?

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp = and decane (bp = 126°C)is shown. -Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what is the liquid composition at the boiling point?

In which case should CO2(g)be more soluble in water?

To make a 0.125 M solution,one could take 0.125 moles of solute and add

At 25.0°C,a solution has a concentration of 3.179 M and a density of 1.260 g/mL.The density of the solution at 50.0°C is 1.249 g/mL.What is the molarity of the solution at 50.0°C?

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp = and decane (bp = 126°C)is shown. -Assume that the vapor at point c is condensed and reboiled.What is the boiling point?

The solubility of argon in water at 25°C is 0.0150 mol/L.What is the Henry's Law constant for argon if the partial pressure of argon in air is 0.00934 atm?

A solution is 2.25% by weight NaHCO3.How many grams of NaHCO3 are in 250.0 g of solution?

What is the freezing point of a solution of 2.86 g MgCl2 in 100 g of water? Kf for water is 1.86°C/m.

________ properties depend only on the identity of the solute and on the number of solute particles present.

Two aqueous solutions,A and B,are separated by a semipermeable membrane.The osmotic pressure of solution A immediately begins to decrease.Which of the following statements is true?

Which should be least soluble in water?

Which of the following solutions will have the lowest freezing point?

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Filters

The solubility of a gas in a liquid is greatest at pressures and temperatures.

A solution is prepared by dissolving 20.0 g of sucrose,C₁₂H₂₂O₁₁,in 250.g of water at 25°C.What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?

The Henry's Law constant of methyl bromide,CH₃Br,is k = 0.159 mol/(L ∙ atm)at 25°C.What is the solubility of methyl bromide in water at 25°C and at a partial pressure of 250.mm Hg?

What is the mole fraction of ethanol in a solution made by dissolving 25.0 g of ethanol,C₂H₅OH,in 53.6 g of water?

In which case should CO₂(g)be more soluble in water?

A solution is 2.25% by weight NaHCO₃.How many grams of NaHCO₃ are in 250.0 g of solution?

What is the freezing point of a solution of 2.86 g MgCl₂ in 100 g of water? K_f for water is 1.86°C/m.