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)

A) 1, 3 B) 1, 2 C) 3 D) 2 E) 2, 3 A) 1, 3 B) 1, 2 C) 3 D) 2 E) 2, 3

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)

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

A) is never positive ( \(\Delta\)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 ( \(\Delta\)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 (\(\Delta\)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 (\(\Delta\)H°soln < 0), because the solute-solvent attraction is always stronger than the combination of the solute-solute attraction and solvent-solvent attraction. E) may be positive, zero, or negative, depending on the relative strength of the solute-solvent, solute-solute, and solvent-solvent attractive forces. A) is never positive ( \(\Delta\)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 ( \(\Delta\)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 (\(\Delta\)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 (\(\Delta\)H°soln < 0), because the solute-solvent attraction is always stronger than the combination of the solute-solute attraction and solvent-solvent attraction. E) may be positive, zero, or negative, depending on the relative strength of the solute-solvent, solute-solute, and solvent-solvent attractive forces.

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

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. 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.

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?

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

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

A) 0.0969 B) 0.0643 C) 0.0883 D) 0.0604 E) 0.357 A) 0.0969 B) 0.0643 C) 0.0883 D) 0.0604 E) 0.357

Exam 12: Physical Properties of Solutions

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?

(Short Answer)

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Question 41

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.

(Multiple Choice)

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Question 42

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.

(Multiple Choice)

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Question 43

Which one of the following would be immiscible with water?

(Multiple Choice)

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Question 44

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

(Multiple Choice)

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Question 45

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)

(Essay)

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Question 46

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.

(Short Answer)

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Question 47

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

(Short Answer)

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Question 48

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.)

(Short Answer)

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Question 49

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)

(Multiple Choice)

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Question 50

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

(Multiple Choice)

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Question 51

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.]

(Short Answer)

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Question 52

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, K_f = 5.12 °C/m, K_b = 2.53 °C/m; for cyclohexane, K_f = 20.0 °C/m, K_b = 2.79°C/m)

(Multiple Choice)

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Question 53

The heat of solution

(Multiple Choice)

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Question 54

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

(Multiple Choice)

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Question 55

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

(Multiple Choice)

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Question 56

Which of the following compounds should be soluble in CCl₄?

(Multiple Choice)

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Question 57

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?

(Multiple Choice)

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Question 58

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)?

(Multiple Choice)

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Question 59

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

(Multiple Choice)

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Question 60

Showing 41 - 60 of 122

Exam 12: Physical Properties of Solutions

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?

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.

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.

Which one of the following would be immiscible with water?

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

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.

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

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.)

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)

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

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.]

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)

The heat of solution

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

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

Which of the following compounds should be soluble in CCl4?

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?

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)?

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

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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?

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.

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.

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

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.

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.)

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)

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.]

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

Which of the following compounds should be soluble in CCl₄?

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?

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)?

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