What is the molality of a solution of 39.8 g of ethanol (CH3CH2OH) in 441 mL of water if the density of water is 1.0 g/mL?

A) 90.2 m B) 1.80 m C) 1.96 m D) 0.0341 m E) 0.0353 m A) 90.2 m B) 1.80 m C) 1.96 m D) 0.0341 m E) 0.0353 m

How many milliliters of 12.4 M HNO3 are needed to prepare 360.6 mL of 0.20 M HNO3?

A) 2.2 F1F1F1S1F1F1F10 101 mL B) 0.349 mL C) 0.034 mL D) 5.8 mL E) 35 mL A) 2.2 F1F1F1S1F1F1F10 101 mL B) 0.349 mL C) 0.034 mL D) 5.8 mL E) 35 mL

Exam 17: Properties of Solutions

Polyethylene is a synthetic polymer or plastic with many uses. 1.40 g of a polyethylene sample was dissolved in enough benzene to make 100. mL of solution, and the osmotic pressure was found to be 1.86 torr at 25°C. What is the molar mass of the polyethylene?

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Question 1

Correct Answer:

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Calculate the freezing point when 25.0 g of ethanol, C₂H₅OH, is dissolved in 500.0 g of H₂O.

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Question 2

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Freezing point = -2.02°C

The osmotic pressure of a solution saturated with a salt M₅X₃ is 1.96 *10^-² atm at 25° C. Calculate K_sp for M₅X₃, assuming ideal behavior.

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Question 3

Correct Answer:

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8.6 *10^-²⁸

An aqueous solution of a compound with a molar mass of 34.02 g/mol is 25.5% by mass and has a density of 1.19 g/cm³. What is the molarity of the solution?

(Multiple Choice)

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Question 4

Which of the following statements is(are) true?

(Multiple Choice)

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Question 5

Predict the deviation from Raoult's law when two liquids are mixed and the heat of the solution is large and the reaction endothermic.

(Multiple Choice)

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Question 6

Which of the following is an emulsion?

(Multiple Choice)

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Question 7

The freezing point (T_f) for t-butanol is 25.50°C, and K_f is 9.1°C/m. Usually t-butanol absorbs water on exposure to the air. If the freezing point of a 13.9-g sample of t-butanol is measured as 24.91°C, how many grams of water are present in the sample?

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Question 8

Calculate the molarity of the solution made by dissolving 100.0 g of calcium nitrate in 450.0 mL of aqueous solution.

(Short Answer)

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Question 9

At a given temperature, the vapor pressure of heptane is 92.0 torr and the vapor pressure of octane is 31.2 torr. Assuming ideal behavior, what is the vapor pressure of a solution that contains three times as many moles of octane as heptane?

(Multiple Choice)

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Question 10

To calculate the freezing point of an ideal dilute solution of a single, nondissociating solute in a solvent, the minimum information one must know is I.The molality (of the solute). II.The molality (of the solute) and the freezing-point-depression constant of the solvent. III.The freezing point of the pure solvent. IV.The molecular weight of the solute. V.The weight of the solvent.

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Question 11

What is the molality of a solution of 39.8 g of ethanol (CH₃CH₂OH) in 441 mL of water if the density of water is 1.0 g/mL?

(Multiple Choice)

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Question 12

How many milliliters of 12.4 M HNO₃ are needed to prepare 360.6 mL of 0.20 M HNO₃?

(Multiple Choice)

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Question 13

Which statement about hydrogen bonding is true?

(Multiple Choice)

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Question 14

The boiling point of pure benzene at 760. torr is 80.1°C. What is the vapor pressure of benzene over a solution containing 4.60 mol of nonvolatile hydrocarbon and 11.60 mol of benzene at 80.1°C?

(Multiple Choice)

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Question 15

An aqueous solution contains 144.0 g of NaCl per liter. What is the molarity of the solution?

(Multiple Choice)

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Question 16

Adding salt to water decreases the freezing point of the water because it lowers the vapor pressure of the ice.

(True/False)

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Question 17

Liquid A has vapor pressure x. Liquid B has vapor pressure y, and x > y. What is the mole fraction of A in the liquid mixture if the vapor above the solution is 30% A?

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Question 18

Using the data below, calculate the vapor pressure of benzene over a chloroform-benzene solution at 25°C, which contains 50.0 g of CHCl₃ and 50.0 g of C₆H₆. Assume that the solution behaves ideally.

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Question 19

The term proof is defined as twice the percent by volume of pure ethanol in solution. Thus, a solution that is 95% (by volume) ethanol is 190 proof. What is the molarity of ethanol in a 92 proof ethanol/water solution?

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Question 20

Showing 1 - 20 of 99

Polyethylene is a synthetic polymer or plastic with many uses. 1.40 g of a polyethylene sample was dissolved in enough benzene to make 100. mL of solution, and the osmotic pressure was found to be 1.86 torr at 25°C. What is the molar mass of the polyethylene?

Calculate the freezing point when 25.0 g of ethanol, C₂H₅OH, is dissolved in 500.0 g of H₂O.

The osmotic pressure of a solution saturated with a salt M₅X₃ is 1.96 *10^-² atm at 25° C. Calculate K_sp for M₅X₃, assuming ideal behavior.

An aqueous solution of a compound with a molar mass of 34.02 g/mol is 25.5% by mass and has a density of 1.19 g/cm³. What is the molarity of the solution?

Which of the following statements is(are) true?

Predict the deviation from Raoult's law when two liquids are mixed and the heat of the solution is large and the reaction endothermic.

Which of the following is an emulsion?

The freezing point (T_f) for t-butanol is 25.50°C, and K_f is 9.1°C/m. Usually t-butanol absorbs water on exposure to the air. If the freezing point of a 13.9-g sample of t-butanol is measured as 24.91°C, how many grams of water are present in the sample?

Calculate the molarity of the solution made by dissolving 100.0 g of calcium nitrate in 450.0 mL of aqueous solution.

At a given temperature, the vapor pressure of heptane is 92.0 torr and the vapor pressure of octane is 31.2 torr. Assuming ideal behavior, what is the vapor pressure of a solution that contains three times as many moles of octane as heptane?

What is the molality of a solution of 39.8 g of ethanol (CH₃CH₂OH) in 441 mL of water if the density of water is 1.0 g/mL?

How many milliliters of 12.4 M HNO₃ are needed to prepare 360.6 mL of 0.20 M HNO₃?

Which statement about hydrogen bonding is true?

The boiling point of pure benzene at 760. torr is 80.1°C. What is the vapor pressure of benzene over a solution containing 4.60 mol of nonvolatile hydrocarbon and 11.60 mol of benzene at 80.1°C?

An aqueous solution contains 144.0 g of NaCl per liter. What is the molarity of the solution?

Adding salt to water decreases the freezing point of the water because it lowers the vapor pressure of the ice.

Liquid A has vapor pressure x. Liquid B has vapor pressure y, and x > y. What is the mole fraction of A in the liquid mixture if the vapor above the solution is 30% A?

Using the data below, calculate the vapor pressure of benzene over a chloroform-benzene solution at 25°C, which contains 50.0 g of CHCl₃ and 50.0 g of C₆H₆. Assume that the solution behaves ideally.

The term proof is defined as twice the percent by volume of pure ethanol in solution. Thus, a solution that is 95% (by volume) ethanol is 190 proof. What is the molarity of ethanol in a 92 proof ethanol/water solution?

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Exam 17: Properties of Solutions

Polyethylene is a synthetic polymer or plastic with many uses. 1.40 g of a polyethylene sample was dissolved in enough benzene to make 100. mL of solution, and the osmotic pressure was found to be 1.86 torr at 25°C. What is the molar mass of the polyethylene?

Calculate the freezing point when 25.0 g of ethanol, C2H5OH, is dissolved in 500.0 g of H2O.

The osmotic pressure of a solution saturated with a salt M5X3 is 1.96 *10-2 atm at 25° C. Calculate Ksp for M5X3, assuming ideal behavior.

An aqueous solution of a compound with a molar mass of 34.02 g/mol is 25.5% by mass and has a density of 1.19 g/cm3. What is the molarity of the solution?

Which of the following statements is(are) true?

Predict the deviation from Raoult's law when two liquids are mixed and the heat of the solution is large and the reaction endothermic.

Which of the following is an emulsion?

The freezing point (Tf) for t-butanol is 25.50°C, and Kf is 9.1°C/m. Usually t-butanol absorbs water on exposure to the air. If the freezing point of a 13.9-g sample of t-butanol is measured as 24.91°C, how many grams of water are present in the sample?

Calculate the molarity of the solution made by dissolving 100.0 g of calcium nitrate in 450.0 mL of aqueous solution.

At a given temperature, the vapor pressure of heptane is 92.0 torr and the vapor pressure of octane is 31.2 torr. Assuming ideal behavior, what is the vapor pressure of a solution that contains three times as many moles of octane as heptane?

What is the molality of a solution of 39.8 g of ethanol (CH3CH2OH) in 441 mL of water if the density of water is 1.0 g/mL?

How many milliliters of 12.4 M HNO3 are needed to prepare 360.6 mL of 0.20 M HNO3?

Which statement about hydrogen bonding is true?

The boiling point of pure benzene at 760. torr is 80.1°C. What is the vapor pressure of benzene over a solution containing 4.60 mol of nonvolatile hydrocarbon and 11.60 mol of benzene at 80.1°C?

An aqueous solution contains 144.0 g of NaCl per liter. What is the molarity of the solution?

Adding salt to water decreases the freezing point of the water because it lowers the vapor pressure of the ice.

Liquid A has vapor pressure x. Liquid B has vapor pressure y, and x > y. What is the mole fraction of A in the liquid mixture if the vapor above the solution is 30% A?

Using the data below, calculate the vapor pressure of benzene over a chloroform-benzene solution at 25°C, which contains 50.0 g of CHCl3 and 50.0 g of C6H6. Assume that the solution behaves ideally.

The term proof is defined as twice the percent by volume of pure ethanol in solution. Thus, a solution that is 95% (by volume) ethanol is 190 proof. What is the molarity of ethanol in a 92 proof ethanol/water solution?

Atoms, Molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Chemical Equilibrium

Acids and Bases

Applications of Aqueous Equilibria

Energy, Enthalpy, and Thermochemistry

Spontaneity, Entropy, and Free Energy

Electrochemistry

Quantum Mechanics and Atomic Theory

Bonding: General Concepts

Covalent Bonding: Orbitals

Chemical Kinetics

Liquids and Solids

The Representative Elements

Transition Metals and Coordination Chemistry

The Nucleus: a Chemists View

Organic and Biochemical Molecules

Filters

Calculate the freezing point when 25.0 g of ethanol, C₂H₅OH, is dissolved in 500.0 g of H₂O.

The osmotic pressure of a solution saturated with a salt M₅X₃ is 1.96 *10^-² atm at 25° C. Calculate K_sp for M₅X₃, assuming ideal behavior.

An aqueous solution of a compound with a molar mass of 34.02 g/mol is 25.5% by mass and has a density of 1.19 g/cm³. What is the molarity of the solution?

The freezing point (T_f) for t-butanol is 25.50°C, and K_f is 9.1°C/m. Usually t-butanol absorbs water on exposure to the air. If the freezing point of a 13.9-g sample of t-butanol is measured as 24.91°C, how many grams of water are present in the sample?

What is the molality of a solution of 39.8 g of ethanol (CH₃CH₂OH) in 441 mL of water if the density of water is 1.0 g/mL?

How many milliliters of 12.4 M HNO₃ are needed to prepare 360.6 mL of 0.20 M HNO₃?

Using the data below, calculate the vapor pressure of benzene over a chloroform-benzene solution at 25°C, which contains 50.0 g of CHCl₃ and 50.0 g of C₆H₆. Assume that the solution behaves ideally.