Question 1

Which of the following statements is true?

Accepted Answer

A)  The solubility of a gas in water increases with increasing pressure.
B)  The solubility of a gas in water decreases with increasing pressure.
C)  The solubility of a gas in water increases with decreasing pressure.
D)  The solubility of a gas in water decreases with decreasing pressure.
E)  None of the above statements are true.

Question 2

Give the term for amount of solute in mole per mass of solvent in kg.

Accepted Answer

A)  molality
B)  molarity
C)  mole fraction
D)  mole percent
E)  mass percent

Question 3

A solution is prepared by adding 1.43 mol of KCl to 889 g of water.The concentration of KCl is ________ molal.

Accepted Answer

A)  1.61 × 10-3
B)  622
C)  0.622
D)  1.27 × 103
E)  1.61

Question 4

Match the following.
-0.010 m Al(NO3) 3

Accepted Answer

A)  largest van't Hoff factor
B)  solution of ionic compound with highest freezing point
C)  solution with ΔTb = 0.026°C
D)  highest boiling point
E)  solution that is most strongly dependent upon pressure

Question 5

What mass of CuCl2 is contained in 75.85 g of a 22.4% by mass solution of CuCl2 in water.

Accepted Answer

A)  17.0 g
B)  5.89 g
C)  29.5 g
D)  33.9 g
E)  11.2 g

Question 6

Choose the aqueous solution with the highest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A)  0.50 m C3H8O3
B)  0.50 m C2H6O2
C)  0.50 m C6H12O6
D)  0.50 m C12H22O11
E)  They all have about the same vapor pressure.

Question 7

Identify the colligative property.

Accepted Answer

A)  vapor pressure lowering
B)  freezing point depression
C)  boiling point elevation
D)  osmotic pressure
E)  all of the above

Question 8

What molality of pentane is obtained by dissolving 15 g pentane,C5H12,in 245.0 g hexane,C6H14?

Accepted Answer

A)  0.058 m
B)  0.068 m
C)  0.85 m
D)  61 m

Question 9

Choose the aqueous solution with the lowest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A)  0.120 m C2H6O2
B)  0.040 m (NH4) 2SO4
C)  0.060 m K2CO3
D)  0.030 m LiC2H3O2
E)  They all have the same vapor pressure.

Question 10

How many moles of KF are contained in 347 g of water in a 0.175 m KF solution?

Accepted Answer

A)  1.65 × 10-2 mol KF
B)  5.04 × 10-2 mol KF
C)  6.07 × 10-2 mol KF
D)  3.22 × 10-2 mol KF
E)  1.98 × 10-2 mol KF

Question 11

Which aqueous solution has the lowest boiling point?

Accepted Answer

A)  0.10 m AlCl3
B)  0.10 m NaCl
C)  0.10 m BaCl2
D)  0.10 m C6H12O6

Question 12

Choose the aqueous solution below with the lowest freezing point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Accepted Answer

A)  0.075 m LiCl
B)  0.075 m (NH4) 3PO4
C)  0.075 m NaBrO4
D)  0.075 m KCN
E)  0.075 m KNO2

Question 13

A 150.0 mL sample of an aqueous solution at 25°C contains 15.2 mg of an unknown nonelectrolyte compound.If the solution has an osmotic pressure of 8.44 torr,what is the molar mass of the unknown compound?

Accepted Answer

A)  223 g/mol
B)  294 g/mol
C)  341 g/mol
D)  448 g/mol
E)  195 g/mol

Question 14

Calculate the molality of a solution formed by dissolving 27.8 g of LiI in 500.0 mL of water.

Accepted Answer

A)  0.254 m
B)  0.394 m
C)  0.556 m
D)  0.241 m
E)  0.415 m

Question 15

Calculate the freezing point of a solution containing 5.0 grams of KCl and 550.0 grams of water.The molal-freezing-point-depression constant (Kf) for water is 1.86°C/m.

Accepted Answer

A)  -0.45°C
B)  +0.45°C
C)  -0.23°C
D)  +0.23°C
E)  1.23°C

Question 16

What is the mole fraction of I2 in a solution made by dissolving 55.6 g of I2 in 245 g of hexane,C6H14?

Accepted Answer

A)  0.0715
B)  0.0770
C)  0.133
D)  0.154

Question 17

A solution of LiCl in water has XLiCl = 0.0900.What is the molality?

Accepted Answer

A)  4.46 m LiCl
B)  5.00 m LiCl
C)  5.49 m LiCl
D)  9.89 m LiCl

Question 18

An aqueous solution is 0.387 M in HCl.What is the molality of the solution if the density is 1.23 g/mL?

Accepted Answer

A)  0.115 m
B)  0.387 m
C)  0.315 m
D)  0.411 m
E)  0.318 m

Question 19

Match the following.
-0.020 m NH4Cl

Accepted Answer

A)  largest van't Hoff factor
B)  solution of ionic compound with highest freezing point
C)  solution with ΔTb = 0.026°C
D)  highest boiling point
E)  solution that is most strongly dependent upon pressure

Question 20

At 20°C,a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL.What is the molality of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

Accepted Answer

A)  2.55
B)  0.0449
C)  2.32
D)  0.446
E)  12.00

Exam 12: Solutions

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Calculate the molality of a solution formed by dissolving 27.8 g of LiI in 500.0 mL of water.

Correct AnswerverifiedShow Answer

An aqueous solution is 0.387 M in HCl.What is the molality of the solution if the density is 1.23 g/mL?

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What mass of CuCl2 is contained in 75.85 g of a 22.4% by mass solution of CuCl2 in water.

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How many moles of KF are contained in 347 g of water in a 0.175 m KF solution?

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Choose the aqueous solution with the highest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Correct AnswerverifiedShow Answer

Give the term for amount of solute in mole per mass of solvent in kg.

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A 150.0 mL sample of an aqueous solution at 25°C contains 15.2 mg of an unknown nonelectrolyte compound.If the solution has an osmotic pressure of 8.44 torr,what is the molar mass of the unknown compound?

Correct AnswerverifiedShow Answer

Choose the aqueous solution below with the lowest freezing point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Correct AnswerverifiedShow Answer

Calculate the freezing point of a solution containing 5.0 grams of KCl and 550.0 grams of water.The molal-freezing-point-depression constant (Kf) for water is 1.86°C/m.

Correct AnswerverifiedShow Answer

Identify the colligative property.

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At 20°C,a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL.What is the molality of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

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A solution is prepared by adding 1.43 mol of KCl to 889 g of water.The concentration of KCl is ________ molal.

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What is the mole fraction of I2 in a solution made by dissolving 55.6 g of I2 in 245 g of hexane,C6H14?

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Which aqueous solution has the lowest boiling point?

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Choose the aqueous solution with the lowest vapor pressure.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.

Correct AnswerverifiedShow Answer

Match the following. -0.010 m Al(NO3) 3

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Match the following. -0.020 m NH4Cl

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A solution of LiCl in water has XLiCl = 0.0900.What is the molality?

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What molality of pentane is obtained by dissolving 15 g pentane,C5H12,in 245.0 g hexane,C6H14?

Correct AnswerverifiedShow Answer

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What mass of CuCl₂ is contained in 75.85 g of a 22.4% by mass solution of CuCl₂ in water.

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Calculate the freezing point of a solution containing 5.0 grams of KCl and 550.0 grams of water.The molal-freezing-point-depression constant (K_f) for water is 1.86°C/m.

Correct Answer
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At 20°C,a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL.What is the molality of ammonium chloride in the solution? The formula weight of NH₄Cl is 53.50 g/mol.

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What is the mole fraction of I₂ in a solution made by dissolving 55.6 g of I₂ in 245 g of hexane,C₆H₁₄?

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Match the following. -0.010 m Al(NO₃) ₃

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Match the following. -0.020 m NH₄Cl

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A solution of LiCl in water has X_LiCl = 0.0900.What is the molality?

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What molality of pentane is obtained by dissolving 15 g pentane,C₅H₁₂,in 245.0 g hexane,C₆H₁₄?

Correct Answer
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