Question 1

What is the mass % of K2SO4 in an aqueous solution that has a mole fraction of K2SO4, X = 0.350

Accepted Answer

A)   80.9%
B)   83.9%
C)   85.9%
D)   87.9%
E)   None of the aboveF) A) and B)
G) A) and D)

Question 2

A 23.0% by mass LiCl solution is prepared in water. What is the mole fraction of the water

Accepted Answer

A)   0.113
B)   0.127
C)   0.873
D)   0.887
E)   0.911F) A) and B)
G) A) and C)

Question 3

The vapor pressure of a solution depends on the chemical nature of the solvent.

Accepted Answer

A) True 
 B)False

Question 4

At 10 ∘\circ∘ C one volume of water dissolves 3.10 volumes of chlorine gas at 1.00 atm pressure. What is the Henry's Law constant in mol/L·atm

Accepted Answer

A)   0.043
B)   0.13
C)   3.1
D)   3.8
E)   36 F) D) and E)
G) A) and C)

Question 5

What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C2H6O2)  and 85.0 g H2O Kf of water is 1.86 ∘\circ∘ C/m.

Accepted Answer

A)   17.6 ∘\circ∘ C
B)   1.50 ∘\circ∘ C
C)   -1.50 ∘\circ∘ C
D)   -17.6 ∘\circ∘ C
E)   -176 ∘\circ∘ C F) A) and E)
G) B) and C)

Question 6

A solution of chloroform, CHCl3, and acetone, (CH3) 2CO, exhibits a negative deviation from Raoult's law. This result implies that

Accepted Answer

A)   chloroform-chloroform interactions are stronger than chloroform-acetone interactions.
B)   chloroform-chloroform interactions are weaker than chloroform-acetone interactions.
C)   acetone-acetone interactions are stronger than chloroform-acetone interactions.
D)   acetone-acetone interactions are weaker than chloroform-acetone interactions.
E)   Both B and D.F)  Both A and C.G) E) and F)
H) A) and B)

Question 7

The osmotic pressure of a 0.010 M MgSO4 solution at 25 ∘\circ∘ C is 0.318 atm. Calculate i, the van't Hoff factor, for this MgSO4 solution.

Accepted Answer

A)   0.013
B)   1.3
C)   1.5
D)   2.0
E)   76.8 F) All of the above
G) B) and E)

Question 8

In how many grams of water should 25.31 g of potassium nitrate (KNO3)  be dissolved to prepare a 0.1982 m solution

Accepted Answer

A)   250.0 g
B)   792.0 g
C)   1000. g
D)   1,263 g
E)   7,917 gF) C) and D)
G) None of the above

Question 9

Using your knowledge of osmosis or osmotic pressure decide if the following statement is true or false:
-Drinking salt water actually dehydrates our tissues.

Accepted Answer

A) True 
 B)False

Question 10

How many liters of ethylene glycol antifreeze (C2H6O2)  would you add to your car radiator containing 15.0 L of water if you needed to protect your engine to -17.8 ∘\circ∘ C (The density of ethylene glycol is 1.1 g/mL. For water, Kf = 1.86 ∘\circ∘ C/m.)

Accepted Answer

A)   6.1 L
B)   7.1 L
C)   8.1 L
D)   9.1 L
E)   None of the above F) A) and B)
G) All of the above C

Question 11

What is the boiling point of a solution of 12.0 g of urea (CH4N2O)  in 165.0 g of water (Kb (H2O)  = 0.52  ∘\circ∘ C/m)

Accepted Answer

A)   99.4 ∘\circ∘ C
B)   100.0  ∘\circ∘ C
C)   100.6 ∘\circ∘ C
D)   106.2 ∘\circ∘ C
E)   108.4 ∘\circ∘ C F) B) and E)
G) None of the above

Question 12

Which of the following concentration units will change with temperature

Accepted Answer

A)   Percent mass
B)   Mole fraction
C)   Molality
D)   Molarity
E)   None of the above will change with temperatureF) A) and C)
G) C) and D) D

Question 13

A 100. mL sample of water is taken from the Great Salt Lake, and the water is allowed to evaporate. The salts that remain (mostly NaCl)  have a mass of 31.9 g Calculate the original concentration of NaCl, in g per liter, in each water sample.

Accepted Answer

A)   349 g/L
B)   339 g/L
C)   329 g/L
D)   319 g/L
E)   None of the aboveF) A) and C)
G) D) and E)

Question 14

Plasma is the fluid portion of blood. The concentration of acetylsalicylic acid (aspirin, C9H8O4, molar mass = 180. g/mol)  in your plasma is found to be 2.99 * 10-4 M after you take two tablets of aspirin. If the volume of your plasma is 5.85 L, what is the molality, m, of aspirin in your blood (Assume density of plasma is 1.00 g/mL.)

Accepted Answer

A)   4.99 * 10-4 m
B)   3.99 * 10-4 m
C)   2.99 * 10-4 m
D)   1.99 * 10-4 m
E)   None of the aboveF) B) and E)
G) C) and D)

Question 15

Pure benzene, C6H6, freezes at 5.5 ∘\circ∘ C and boils at 80.1 ∘\circ∘ C. What is the boiling point of a solution consisting of cyclohexane (C6H12)  dissolved in benzene if the freezing point of this solution is 0.0 ∘\circ∘ C (For benzene, Kf = 5.12  ∘\circ∘ C/m, Kb = 2.53  ∘\circ∘ C/m; for cyclohexane, Kf = 20.0  ∘\circ∘ C/m, Kb = 2.79 ∘\circ∘ C/m)

Accepted Answer

A)   77.4 ∘\circ∘ C
B)   80.9 ∘\circ∘ C
C)   82.8 ∘\circ∘ C
D)   83.1 ∘\circ∘ C
E)   91.2 ∘\circ∘ C F) B) and C)
G) A) and B)

Question 16

How many grams of sucrose (C12H22O11, 342.3 g/mol)  would be needed to make 2.5 L of a solution with an osmotic pressure of 14 atm at 25 ∘\circ∘ C (R = 0.0821 L·atm/K·mol)

Accepted Answer

A)   0.57 g
B)   6.8 g
C)   2.0 * 102 g
D)   4.9 * 102 g
E)   5.8 * 103 g F) D) and E)
G) A) and E) D

Question 17

Calculate the freezing point of a solution made from 22.0 g of octane (C8H18)  dissolved in 148.0 g of benzene. Benzene freezes at 5.50 ∘\circ∘ C and its Kf value is 5.12 ∘\circ∘ C/m.

Accepted Answer

A)   -1.16 ∘\circ∘ C
B)   0.98 ∘\circ∘ C
C)   5.49 ∘\circ∘ C
D)   6.66 ∘\circ∘ C
E)   12.2 ∘\circ∘ C F) A) and B)
G) A) and C)

Question 18

What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C3H7OH)  dissolved in enough water to make 500. mL of solution at 27 ∘\circ∘ C

Accepted Answer

A)   0.0100 atm
B)   0.0140 atm
C)   0.0370 atm
D)   0.456 atm
E)   11.2 atm F) A) and B)
G) B) and D)

Question 19

Which of the following liquids would make a good solvent for iodine, I2

Accepted Answer

A)   HCl
B)   H2O
C)   CH3OH
D)   NH3
E)   CS2F) A) and D)
G) C) and D)

Question 20

What is the mole fraction of sodium phosphate in a 0.142 M Na3PO4(aq)  solution that has a density of 1.015 g/mL

Accepted Answer

A)   0.00157
B)   0.00257
C)   0.00357
D)   0.00457
E)   None of the aboveF) A) and B)
G) A) and C)

Exam 12: Physical Properties of Solutions

What is the mass % of K₂SO₄ in an aqueous solution that has a mole fraction of K₂SO₄, X = 0.350

Correct Answer
verified

A 23.0% by mass LiCl solution is prepared in water. What is the mole fraction of the water

Correct Answer
verified

The vapor pressure of a solution depends on the chemical nature of the solvent.

Correct Answer
verified

At 10^$\circ$C one volume of water dissolves 3.10 volumes of chlorine gas at 1.00 atm pressure. What is the Henry's Law constant in mol/L·atm

Correct Answer
verified

What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C₂H₆O₂) and 85.0 g H₂O K_f of water is 1.86^$\circ$C/m.

Correct Answer
verified

A solution of chloroform, CHCl₃, and acetone, (CH₃) ₂CO, exhibits a negative deviation from Raoult's law. This result implies that

Correct Answer
verified

The osmotic pressure of a 0.010 M MgSO₄ solution at 25^$\circ$C is 0.318 atm. Calculate i, the van't Hoff factor, for this MgSO₄ solution.

Correct Answer
verified

In how many grams of water should 25.31 g of potassium nitrate (KNO₃) be dissolved to prepare a 0.1982 m solution

Correct Answer
verified

Using your knowledge of osmosis or osmotic pressure decide if the following statement is true or false: -Drinking salt water actually dehydrates our tissues.

Correct Answer
verified

How many liters of ethylene glycol antifreeze (C₂H₆O₂) would you add to your car radiator containing 15.0 L of water if you needed to protect your engine to -17.8^$\circ$C (The density of ethylene glycol is 1.1 g/mL. For water, K_f = 1.86^$\circ$C/m.)

Correct Answer
verified
C

What is the boiling point of a solution of 12.0 g of urea (CH₄N₂O) in 165.0 g of water (K_b (H₂O) = 0.52 ^$\circ$C/m)

Correct Answer
verified

Which of the following concentration units will change with temperature

Correct Answer
verified
D

A 100. mL sample of water is taken from the Great Salt Lake, and the water is allowed to evaporate. The salts that remain (mostly NaCl) have a mass of 31.9 g Calculate the original concentration of NaCl, in g per liter, in each water sample.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

How many grams of sucrose (C₁₂H₂₂O₁₁, 342.3 g/mol) would be needed to make 2.5 L of a solution with an osmotic pressure of 14 atm at 25^$\circ$C (R = 0.0821 L·atm/K·mol)

Correct Answer
verified
D

Calculate the freezing point of a solution made from 22.0 g of octane (C₈H₁₈) dissolved in 148.0 g of benzene. Benzene freezes at 5.50^$\circ$C and its K_f value is 5.12^$\circ$C/m.

Correct Answer
verified

What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C₃H₇OH) dissolved in enough water to make 500. mL of solution at 27^$\circ$C

Correct Answer
verified

Which of the following liquids would make a good solvent for iodine, I₂

Correct Answer
verified

What is the mole fraction of sodium phosphate in a 0.142 M Na₃PO₄(aq) solution that has a density of 1.015 g/mL

Correct Answer
verified

Exam 12: Physical Properties of Solutions

What is the mass % of K2SO4 in an aqueous solution that has a mole fraction of K2SO4, X = 0.350

Correct AnswerverifiedShow Answer

A 23.0% by mass LiCl solution is prepared in water. What is the mole fraction of the water

Correct AnswerverifiedShow Answer

The vapor pressure of a solution depends on the chemical nature of the solvent.

Correct AnswerverifiedShow Answer

At 10 ∘\circ∘ C one volume of water dissolves 3.10 volumes of chlorine gas at 1.00 atm pressure. What is the Henry's Law constant in mol/L·atm

Correct AnswerverifiedShow Answer

What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C2H6O2) and 85.0 g H2O Kf of water is 1.86 ∘\circ∘ C/m.

Correct AnswerverifiedShow Answer

A solution of chloroform, CHCl3, and acetone, (CH3) 2CO, exhibits a negative deviation from Raoult's law. This result implies that

Correct AnswerverifiedShow Answer

The osmotic pressure of a 0.010 M MgSO4 solution at 25 ∘\circ∘ C is 0.318 atm. Calculate i, the van't Hoff factor, for this MgSO4 solution.

Correct AnswerverifiedShow Answer

In how many grams of water should 25.31 g of potassium nitrate (KNO3) be dissolved to prepare a 0.1982 m solution

Correct AnswerverifiedShow Answer

Using your knowledge of osmosis or osmotic pressure decide if the following statement is true or false: -Drinking salt water actually dehydrates our tissues.

Correct AnswerverifiedShow Answer

How many liters of ethylene glycol antifreeze (C2H6O2) would you add to your car radiator containing 15.0 L of water if you needed to protect your engine to -17.8 ∘\circ∘ C (The density of ethylene glycol is 1.1 g/mL. For water, Kf = 1.86 ∘\circ∘ C/m.)

Correct AnswerverifiedC

What is the boiling point of a solution of 12.0 g of urea (CH4N2O) in 165.0 g of water (Kb (H2O) = 0.52 ∘\circ∘ C/m)

Correct AnswerverifiedShow Answer

Which of the following concentration units will change with temperature

Correct AnswerverifiedD

A 100. mL sample of water is taken from the Great Salt Lake, and the water is allowed to evaporate. The salts that remain (mostly NaCl) have a mass of 31.9 g Calculate the original concentration of NaCl, in g per liter, in each water sample.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How many grams of sucrose (C12H22O11, 342.3 g/mol) would be needed to make 2.5 L of a solution with an osmotic pressure of 14 atm at 25 ∘\circ∘ C (R = 0.0821 L·atm/K·mol)

Correct AnswerverifiedD

Calculate the freezing point of a solution made from 22.0 g of octane (C8H18) dissolved in 148.0 g of benzene. Benzene freezes at 5.50 ∘\circ∘ C and its Kf value is 5.12 ∘\circ∘ C/m.

Correct AnswerverifiedShow Answer

What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C3H7OH) dissolved in enough water to make 500. mL of solution at 27 ∘\circ∘ C

Correct AnswerverifiedShow Answer

Which of the following liquids would make a good solvent for iodine, I2

Correct AnswerverifiedShow Answer

What is the mole fraction of sodium phosphate in a 0.142 M Na3PO4(aq) solution that has a density of 1.015 g/mL

Correct AnswerverifiedShow Answer

What is the mass % of K₂SO₄ in an aqueous solution that has a mole fraction of K₂SO₄, X = 0.350

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

At 10^$\circ$C one volume of water dissolves 3.10 volumes of chlorine gas at 1.00 atm pressure. What is the Henry's Law constant in mol/L·atm

Correct Answer
verified

What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C₂H₆O₂) and 85.0 g H₂O K_f of water is 1.86^$\circ$C/m.

Correct Answer
verified

A solution of chloroform, CHCl₃, and acetone, (CH₃) ₂CO, exhibits a negative deviation from Raoult's law. This result implies that

Correct Answer
verified

The osmotic pressure of a 0.010 M MgSO₄ solution at 25^$\circ$C is 0.318 atm. Calculate i, the van't Hoff factor, for this MgSO₄ solution.

Correct Answer
verified

In how many grams of water should 25.31 g of potassium nitrate (KNO₃) be dissolved to prepare a 0.1982 m solution

Correct Answer
verified

Correct Answer
verified

How many liters of ethylene glycol antifreeze (C₂H₆O₂) would you add to your car radiator containing 15.0 L of water if you needed to protect your engine to -17.8^$\circ$C (The density of ethylene glycol is 1.1 g/mL. For water, K_f = 1.86^$\circ$C/m.)

Correct Answer
verified
C

What is the boiling point of a solution of 12.0 g of urea (CH₄N₂O) in 165.0 g of water (K_b (H₂O) = 0.52 ^$\circ$C/m)

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

How many grams of sucrose (C₁₂H₂₂O₁₁, 342.3 g/mol) would be needed to make 2.5 L of a solution with an osmotic pressure of 14 atm at 25^$\circ$C (R = 0.0821 L·atm/K·mol)

Correct Answer
verified
D

Calculate the freezing point of a solution made from 22.0 g of octane (C₈H₁₈) dissolved in 148.0 g of benzene. Benzene freezes at 5.50^$\circ$C and its K_f value is 5.12^$\circ$C/m.

Correct Answer
verified

What is the osmotic pressure of a solution that contains 13.7 g of propyl alcohol (C₃H₇OH) dissolved in enough water to make 500. mL of solution at 27^$\circ$C

Correct Answer
verified

Which of the following liquids would make a good solvent for iodine, I₂

Correct Answer
verified

What is the mole fraction of sodium phosphate in a 0.142 M Na₃PO₄(aq) solution that has a density of 1.015 g/mL

Correct Answer
verified