Question 1

A research chemist isolates a new compound with an empirical formula C3H3O2.Dissolving 2.51 g of the compound in 100.g of water produces a solution with a freezing point of -0.325°C.What is the molecular formula of the compound? (For water, Kf = 1.86°C/m.)

Accepted Answer

Question 2

When 24.0 g of glucose (a nonelectrolyte) are dissolved in 500.g of water, the solution has a freezing point of -0.47°C.What is the molar mass of glucose? Kf of water is 1.86°C/m.

Accepted Answer

A)  41.9 g
B)  47.5 g
C)  54.9 g
D)  178 g
E)  190.gF) B) and C)
G) C) and D)

Question 3

When 20.0 grams of an unknown compound are dissolved in 500.grams of benzene, the freezing point of the resulting solution is 3.77°C.The freezing point of pure benzene is 5.444°C, and the Kf for benzene is 5.12°C/m.What is the molar mass of the unknown compound?

Accepted Answer

Question 4

What is the concentration of O2(g)in water at 25°C exposed to a partial pressure of oxygen of 325 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 × 10-3 mol/L·atm.

Accepted Answer

Question 5

A solution that is 33.6 % by mass of phenol (C6H5OH) in water is prepared.What is the mole fraction of the phenol?

Accepted Answer

A)  0.0969
B)  0.0643
C)  0.0883
D)  0.0604
E)  0.357F) A) and B)
G) B) and E)

Question 6

Which response lists all the following pairs that are miscible liquids. Pair #1: octane (C8H18) and water
Pair #2: acetic acid (CH3COOH) and water
Pair #3: octane (C8H18) and carbon tetrachloride(CCl4)

Accepted Answer

A)  1, 3
B)  1, 2
C)  3
D)  2
E)  2, 3F) D) and E)
G) B) and E)

Question 7

What is the molality of an aqueous KBr solution with a mole fraction of KBr, X, equal to 0.245?

Accepted Answer

A)  0.325 m
B)  0.682 m
C)  13.6 m
D)  18.0 m
E)  29.2 mF) None of the above
G) A) and D)

Question 8

A solution made of pentane and hexane has a mole fraction, X = 0.250 of pentane.Which substance is the solute?

Accepted Answer

The answer of A solution made of pentane and hexane...

Question 9

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100.g of benzene by 0.47°C? Kf of benzene is 5.12°C/m.

Accepted Answer

A)  927 g/mol
B)  92.6 g/mol
C)  81.8 g/mol
D)  78.0 g/mol
E)  10.7 g/molF) B) and C)
G) A) and B)

Question 10

Pure benzene, C6H6, freezes at 5.5° and boils at 80.1°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°C? (For benzene, Kf = 5.12 °C/m, Kb = 2.53 °C/m; for cyclohexane, Kf = 20.0 °C/m, Kb = 2.79°C/m)

Accepted Answer

A)  77.4°C
B)  80.9°C
C)  82.8°C
D)  83.1°C
E)  91.2°CF) A) and C)
G) B) and E)

Question 11

Which of the following compounds should be soluble in CCl4?

Accepted Answer

A)  NaCl
B)  H2O
C)  NaOH
D)  C8H18
E)  None of theseF) A) and D)
G) A) and C)

Question 12

Arrange the following aqueous solutions in order of increasing boiling points: 0.300m C6H12O6, 0.110m K2CO3, and 0.050m Al(ClO4) 3

Accepted Answer

A)  C6H12O6 2CO3 4) 3
B)  Al(ClO4) 3 6H12O6 2CO3
C)  C6H12O6 4) 3 2CO3
D)  K2CO3 6H12O6 4) 3
E)  K2CO3 4) 3 6H12O6F) B) and D)
G) D) and E)

Question 13

The heat of solution

Accepted Answer

A)  is never positive (  Δ\DeltaΔ H°soln  ≤\le≤  0) , because the solute-solvent attraction is never weaker than the combination of the solute-solute attraction and solvent-solvent attraction.
B)  is always positive (  Δ\DeltaΔ H°soln > 0) , because the solute-solvent attraction is always weaker than the combination of the solute-solute attraction and solvent-solvent attraction.
C)  is always zero ( Δ\DeltaΔ H°soln = 0) , because the solute-solvent attraction is defined as the average of the solute-solute attraction and solvent-solvent attraction.
D)  is always negative ( Δ\DeltaΔ H°soln 
E)  may be positive, zero, or negative, depending on the relative strength of the solute-solvent, solute-solute, and solvent-solvent attractive forces. F) B) and E)
G) A) and D)

Question 14

Maple syrup is mostly a solution of sucrose in water.Calculate the molality of the syrup if a sample freezes at -0.50°C, assuming the solute is pure sucrose.[For water, Kf is 1.86°C/m.]

Accepted Answer

Question 15

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) B) and C)
H) A) and B)

Question 16

Which of the following aqueous solutions has the highest osmotic pressure at 25°C (assume 100% dissociation for all soluble ionic compounds) ?

Accepted Answer

A)  0.15m K3PO4
B)  0.20m KI
C)  0.25m K2CO3
D)  0.30m NH4NO3
E)  0.45m C12H22O11F) B) and D)
G) A) and E)

Question 17

Which one of the following would be immiscible with water?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) A) and E)
G) B) and D)

Question 18

An organic compound was prepared and purified by chromatography.A conductivity measurement showed the compound to be a nonelectrolyte.Elemental analysis gave an empirical formula of CH3O.A 0.127 g sample of the compound was dissolved in water and diluted to 100.0 mL, and the osmotic pressure of that solution was determined to 0.492 atm at 20°C.Determine the molar mass and molecular formula of the compound.(R = 0.0821 L.atm/K.mol)

Accepted Answer

62.1 g/mol...

Question 19

If 14.2 g of Al(NO3) 3 is dissolved in 655g of water, what is the boiling point of the solution (assume 100% dissociation, Kb (H2O) = 0.52 °C/m) ?

Accepted Answer

A)  99.8°C
B)  99.9°C
C)  100.1°C
D)  100.2°C
E)  100.4°CF) A) and B)
G) None of the above

Question 20

A 9.50 % by mass solution of acetone (C3H6O) in water has a density of 0.9849 g/mL at 20°C.What is the molarity of this solution?

Accepted Answer

A)  0.621 M
B)  1.61 M
C)  1.66 M
D)  1.71 M
E)  16.9 MF) A) and B)
G) C) and D)

Exam 12: Physical Properties of Solutions

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100.g of benzene by 0.47°C? K_f of benzene is 5.12°C/m.

Correct Answer
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Which of the following compounds should be soluble in CCl₄?

Correct Answer
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Which one of the following would be immiscible with water?

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

Correct Answer
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Which response lists all the following pairs that are miscible liquids. Pair #1: octane (C₈H₁₈) and water Pair #2: acetic acid (CH₃COOH) and water Pair #3: octane (C₈H₁₈) and carbon tetrachloride(CCl₄)

Correct Answer
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Which of the following aqueous solutions has the highest osmotic pressure at 25°C (assume 100% dissociation for all soluble ionic compounds) ?

Correct Answer
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Maple syrup is mostly a solution of sucrose in water.Calculate the molality of the syrup if a sample freezes at -0.50°C, assuming the solute is pure sucrose.[For water, K_f is 1.86°C/m.]

Correct Answer
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What is the concentration of O₂(g)in water at 25°C exposed to a partial pressure of oxygen of 325 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 × 10^-3 mol/L·atm.

Correct Answer
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A 9.50 % by mass solution of acetone (C₃H₆O) in water has a density of 0.9849 g/mL at 20°C.What is the molarity of this solution?

Correct Answer
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When 24.0 g of glucose (a nonelectrolyte) are dissolved in 500.g of water, the solution has a freezing point of -0.47°C.What is the molar mass of glucose? K_f of water is 1.86°C/m.

Correct Answer
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What is the molality of an aqueous KBr solution with a mole fraction of KBr, X, equal to 0.245?

Correct Answer
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Correct Answer
verified
62.1 g/mol...
View Answer

When 20.0 grams of an unknown compound are dissolved in 500.grams of benzene, the freezing point of the resulting solution is 3.77°C.The freezing point of pure benzene is 5.444°C, and the K_f for benzene is 5.12°C/m.What is the molar mass of the unknown compound?

Correct Answer
verified

If 14.2 g of Al(NO₃) ₃ is dissolved in 655g of water, what is the boiling point of the solution (assume 100% dissociation, K_b (H₂O) = 0.52 °C/m) ?

Correct Answer
verified

A solution that is 33.6 % by mass of phenol (C₆H₅OH) in water is prepared.What is the mole fraction of the phenol?

Correct Answer
verified

A research chemist isolates a new compound with an empirical formula C₃H₃O₂.Dissolving 2.51 g of the compound in 100.g of water produces a solution with a freezing point of -0.325°C.What is the molecular formula of the compound? (For water, K_f = 1.86°C/m.)

Correct Answer
verified

A solution made of pentane and hexane has a mole fraction, X = 0.250 of pentane.Which substance is the solute?

Correct Answer
verified

Arrange the following aqueous solutions in order of increasing boiling points: 0.300m C₆H₁₂O₆, 0.110m K₂CO₃, and 0.050m Al(ClO₄) ₃

Correct Answer
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Correct Answer
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The heat of solution

Correct Answer
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Exam 12: Physical Properties of Solutions

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100.g of benzene by 0.47°C? Kf of benzene is 5.12°C/m.

Correct AnswerverifiedShow Answer

Which of the following compounds should be soluble in CCl4?

Correct AnswerverifiedShow Answer

Which one of the following would be immiscible with water?

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

Which response lists all the following pairs that are miscible liquids. Pair #1: octane (C8H18) and water Pair #2: acetic acid (CH3COOH) and water Pair #3: octane (C8H18) and carbon tetrachloride(CCl4)

Correct AnswerverifiedShow Answer

Which of the following aqueous solutions has the highest osmotic pressure at 25°C (assume 100% dissociation for all soluble ionic compounds) ?

Correct AnswerverifiedShow Answer

Maple syrup is mostly a solution of sucrose in water.Calculate the molality of the syrup if a sample freezes at -0.50°C, assuming the solute is pure sucrose.[For water, Kf is 1.86°C/m.]

Correct AnswerverifiedShow Answer

What is the concentration of O2(g)in water at 25°C exposed to a partial pressure of oxygen of 325 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 × 10-3 mol/L·atm.

Correct AnswerverifiedShow Answer

A 9.50 % by mass solution of acetone (C3H6O) in water has a density of 0.9849 g/mL at 20°C.What is the molarity of this solution?

Correct AnswerverifiedShow Answer

When 24.0 g of glucose (a nonelectrolyte) are dissolved in 500.g of water, the solution has a freezing point of -0.47°C.What is the molar mass of glucose? Kf of water is 1.86°C/m.

Correct AnswerverifiedShow Answer

What is the molality of an aqueous KBr solution with a mole fraction of KBr, X, equal to 0.245?

Correct AnswerverifiedShow Answer

Correct Answerverified62.1 g/mol...View AnswerShow Answer

When 20.0 grams of an unknown compound are dissolved in 500.grams of benzene, the freezing point of the resulting solution is 3.77°C.The freezing point of pure benzene is 5.444°C, and the Kf for benzene is 5.12°C/m.What is the molar mass of the unknown compound?

Correct AnswerverifiedShow Answer

If 14.2 g of Al(NO3) 3 is dissolved in 655g of water, what is the boiling point of the solution (assume 100% dissociation, Kb (H2O) = 0.52 °C/m) ?

Correct AnswerverifiedShow Answer

A solution that is 33.6 % by mass of phenol (C6H5OH) in water is prepared.What is the mole fraction of the phenol?

Correct AnswerverifiedShow Answer

A research chemist isolates a new compound with an empirical formula C3H3O2.Dissolving 2.51 g of the compound in 100.g of water produces a solution with a freezing point of -0.325°C.What is the molecular formula of the compound? (For water, Kf = 1.86°C/m.)

Correct AnswerverifiedShow Answer

A solution made of pentane and hexane has a mole fraction, X = 0.250 of pentane.Which substance is the solute?

Correct AnswerverifiedShow Answer

Arrange the following aqueous solutions in order of increasing boiling points: 0.300m C6H12O6, 0.110m K2CO3, and 0.050m Al(ClO4) 3

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The heat of solution

Correct AnswerverifiedShow Answer

What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100.g of benzene by 0.47°C? K_f of benzene is 5.12°C/m.

Correct Answer
verified

Which of the following compounds should be soluble in CCl₄?

Correct Answer
verified

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

Correct Answer
verified

Which response lists all the following pairs that are miscible liquids. Pair #1: octane (C₈H₁₈) and water Pair #2: acetic acid (CH₃COOH) and water Pair #3: octane (C₈H₁₈) and carbon tetrachloride(CCl₄)

Correct Answer
verified

Correct Answer
verified

Maple syrup is mostly a solution of sucrose in water.Calculate the molality of the syrup if a sample freezes at -0.50°C, assuming the solute is pure sucrose.[For water, K_f is 1.86°C/m.]

Correct Answer
verified

What is the concentration of O₂(g)in water at 25°C exposed to a partial pressure of oxygen of 325 mmHg? The Henry's law constant for oxygen gas at 25°C is 1.3 × 10^-3 mol/L·atm.

Correct Answer
verified

A 9.50 % by mass solution of acetone (C₃H₆O) in water has a density of 0.9849 g/mL at 20°C.What is the molarity of this solution?

Correct Answer
verified

When 24.0 g of glucose (a nonelectrolyte) are dissolved in 500.g of water, the solution has a freezing point of -0.47°C.What is the molar mass of glucose? K_f of water is 1.86°C/m.

Correct Answer
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Correct Answer
verified

Correct Answer
verified
62.1 g/mol...
View Answer

When 20.0 grams of an unknown compound are dissolved in 500.grams of benzene, the freezing point of the resulting solution is 3.77°C.The freezing point of pure benzene is 5.444°C, and the K_f for benzene is 5.12°C/m.What is the molar mass of the unknown compound?

Correct Answer
verified

If 14.2 g of Al(NO₃) ₃ is dissolved in 655g of water, what is the boiling point of the solution (assume 100% dissociation, K_b (H₂O) = 0.52 °C/m) ?

Correct Answer
verified

A solution that is 33.6 % by mass of phenol (C₆H₅OH) in water is prepared.What is the mole fraction of the phenol?

Correct Answer
verified

A research chemist isolates a new compound with an empirical formula C₃H₃O₂.Dissolving 2.51 g of the compound in 100.g of water produces a solution with a freezing point of -0.325°C.What is the molecular formula of the compound? (For water, K_f = 1.86°C/m.)

Correct Answer
verified

Correct Answer
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Arrange the following aqueous solutions in order of increasing boiling points: 0.300m C₆H₁₂O₆, 0.110m K₂CO₃, and 0.050m Al(ClO₄) ₃

Correct Answer
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Correct Answer
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Correct Answer
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