At 28.0°C, the vapor pressure of n-propyl mercaptan, C3H7SH, is 175 torr, while that of acetonitrile, CH3CN, is 102 torr. What is the vapor pressure, at 28.0°C, of a solution made by mixing 100.0 g of C3H7SH and 100.0 g CH3CN, if Raoult's Law is obeyed?

A) 35.7 torr B) 128 torr C) 139 torr D) 149 torr E) 277 torr A) 35.7 torr B) 128 torr C) 139 torr D) 149 torr E) 277 torr

A solution of sodium nitrite is prepared by mixing 3.25 g of NaNO2 with 12.0 g of water. The percent, by mass, of NaNO2 is

A) 28.0%. B) 23.3%. C) 27.0%. D) 21.3%. E) 37.1%. A) 28.0%. B) 23.3%. C) 27.0%. D) 21.3%. E) 37.1%.

Exam 13: Mixtures at the Molecular Level: Properties of Solutions

A solution is prepared by mixing 0.3355 moles of NaNO₃ (84.995 g mol^-1)with 235.0 g of water (18.015 g mol^-1). Its density is 1.0733 g mL^-1. What is the molarity of the solution?

(Multiple Choice)

4.9/5

(40)

Question 61

A solution is sitting undisturbed on a side shelf in the laboratory. A small crystal of the same solute of which the solution is made was gently dropped into the solution. Suddenly, a mass of crystals forms and settles to the bottom of the container. The solution is, or must have been

(Multiple Choice)

4.9/5

(37)

Question 62

Calculate the molality of a 25.0% by mass solution of MgCl₂ in H₂O. The density of this solution is 1.127 g/mL.

(Short Answer)

4.9/5

(32)

Question 63

A solution is made by dissolving 1.25 moles of magnesium nitrate in 300.0 g of water. If the van't Hoff factor, i, for this particular concentration is 2.25, what is the expected freezing point of this solution? K_f = 1.86 °C m^-1.

(Multiple Choice)

4.8/5

(36)

Question 64

An unknown ionic substance has a van't Hoff factor of 1.89 with a concentration of 0.1 M. If the concentration of this ionic substance was increased to 0.5 M the value of the van't Hoff factor would ________. Hint: Dilute solutions behave closer to expectations than concentrated solutions.

(Short Answer)

4.9/5

(35)

Question 65

9.92 grams of a compound with a molar mass of 124.0 grams/mole when dissolved in 150.0 grams of water gave a solution that had a freezing point of -2.69°C. Calculate the experimental value of the van't Hoff factor. K_f = 1.86 °C m^-1.

(Multiple Choice)

4.8/5

(38)

Question 66

An aqueous solution made by dissolving 168 mg of an unknown compound (a nonelectrolyte)in enough water to make 500.0 mL of solution, develops an osmotic pressure of 5.22 torr at a temperature of 23.5°C. What is the molecular mass of this unknown compound?Hint: Find molarity, then moles, then molar mass, being sure to keep track of units.

(Multiple Choice)

4.7/5

(41)

Question 67

The van't Hoff factor describes to what degree an ionic substance ________.

(Short Answer)

4.9/5

(43)

Question 68

An aqueous solution of orthophosphoric acid, H₃PO₄, has a measured density of 1.2089 g mL^-1 and is 5.257 molal. How many moles of H₃PO₄ are there in one liter of this solution?

(Multiple Choice)

4.9/5

(34)

Question 69

At 28.0°C, the vapor pressure of n-propyl mercaptan, C₃H₇SH, is 175 torr, while that of acetonitrile, CH₃CN, is 102 torr. What is the vapor pressure, at 28.0°C, of a solution made by mixing 100.0 g of C₃H₇SH and 100.0 g CH₃CN, if Raoult's Law is obeyed?

(Multiple Choice)

4.9/5

(33)

Question 70

An aqueous solution of ethanol, C₂H₅OH, is 19.00% ethanol by mass and has a density of 0.9700 g mL^-1. Calculate the molality of the ethanol solution.

(Multiple Choice)

4.9/5

(42)

Question 71

Which aqueous solution will have the highest boiling point temperature?

(Multiple Choice)

4.9/5

(31)

Question 72

Which of the following would best be classified as a heterogeneous suspension?

(Multiple Choice)

4.8/5

(45)

Question 73

Wax is a solid mixture of hydrocarbon compounds consisting of molecules with long chains of carbon atoms. Which solvent would you expect to be most capable of dissolving wax?

(Multiple Choice)

4.9/5

(35)

Question 74

A solution in a beaker has some un-dissolved solute lying on the bottom of the beaker. If the rate of dissolution of the solute exceeds the rate of crystallization, the solution is described as

(Multiple Choice)

4.9/5

(36)

Question 75

A solution is made by mixing acetone and methyl alcohol, whose structures are shown as I and II below. Which statement below best describes the characteristics of this mixture? Hint: How does the strength of hydrogen bonds compare to other intermolecular forces?

(Multiple Choice)

4.9/5

(36)

Question 76

The mixture of air bubbles in whipped cream would best be classified as

(Multiple Choice)

4.7/5

(48)

Question 77

A solution of sodium nitrite is prepared by mixing 3.25 g of NaNO₂ with 12.0 g of water. The percent, by mass, of NaNO₂ is

(Multiple Choice)

4.9/5

(37)

Question 78

A mixture of fine sand in water would best be classified as what kind of solution or mixture?

(Short Answer)

4.9/5

(43)

Question 79

A solution of sodium nitrate, NaNO₃, in water is 5.181 molar and its density is 1.2680 g mL^-1. Calculate the percent, by weight, of sodium nitrate in the solution.

(Multiple Choice)

4.8/5

(42)

Question 80

Showing 61 - 80 of 133

Exam 13: Mixtures at the Molecular Level: Properties of Solutions

A solution is prepared by mixing 0.3355 moles of NaNO3 (84.995 g mol-1)with 235.0 g of water (18.015 g mol-1). Its density is 1.0733 g mL-1. What is the molarity of the solution?

A solution is sitting undisturbed on a side shelf in the laboratory. A small crystal of the same solute of which the solution is made was gently dropped into the solution. Suddenly, a mass of crystals forms and settles to the bottom of the container. The solution is, or must have been

Calculate the molality of a 25.0% by mass solution of MgCl2 in H2O. The density of this solution is 1.127 g/mL.

A solution is made by dissolving 1.25 moles of magnesium nitrate in 300.0 g of water. If the van't Hoff factor, i, for this particular concentration is 2.25, what is the expected freezing point of this solution? Kf = 1.86 °C m-1.

An unknown ionic substance has a van't Hoff factor of 1.89 with a concentration of 0.1 M. If the concentration of this ionic substance was increased to 0.5 M the value of the van't Hoff factor would ________. Hint: Dilute solutions behave closer to expectations than concentrated solutions.

9.92 grams of a compound with a molar mass of 124.0 grams/mole when dissolved in 150.0 grams of water gave a solution that had a freezing point of -2.69°C. Calculate the experimental value of the van't Hoff factor. Kf = 1.86 °C m-1.

The van't Hoff factor describes to what degree an ionic substance ________.

An aqueous solution of orthophosphoric acid, H3PO4, has a measured density of 1.2089 g mL-1 and is 5.257 molal. How many moles of H3PO4 are there in one liter of this solution?

At 28.0°C, the vapor pressure of n-propyl mercaptan, C3H7SH, is 175 torr, while that of acetonitrile, CH3CN, is 102 torr. What is the vapor pressure, at 28.0°C, of a solution made by mixing 100.0 g of C3H7SH and 100.0 g CH3CN, if Raoult's Law is obeyed?

An aqueous solution of ethanol, C2H5OH, is 19.00% ethanol by mass and has a density of 0.9700 g mL-1. Calculate the molality of the ethanol solution.

Which aqueous solution will have the highest boiling point temperature?

Which of the following would best be classified as a heterogeneous suspension?

Wax is a solid mixture of hydrocarbon compounds consisting of molecules with long chains of carbon atoms. Which solvent would you expect to be most capable of dissolving wax?

A solution in a beaker has some un-dissolved solute lying on the bottom of the beaker. If the rate of dissolution of the solute exceeds the rate of crystallization, the solution is described as

A solution is made by mixing acetone and methyl alcohol, whose structures are shown as I and II below. Which statement below best describes the characteristics of this mixture? Hint: How does the strength of hydrogen bonds compare to other intermolecular forces?

The mixture of air bubbles in whipped cream would best be classified as

A solution of sodium nitrite is prepared by mixing 3.25 g of NaNO2 with 12.0 g of water. The percent, by mass, of NaNO2 is

A mixture of fine sand in water would best be classified as what kind of solution or mixture?

A solution of sodium nitrate, NaNO3, in water is 5.181 molar and its density is 1.2680 g mL-1. Calculate the percent, by weight, of sodium nitrate in the solution.

A Very Brief History of Chemistry

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Intermolecular Attractions and the Properties of Liquids and Solids

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

A solution is prepared by mixing 0.3355 moles of NaNO₃ (84.995 g mol^-1)with 235.0 g of water (18.015 g mol^-1). Its density is 1.0733 g mL^-1. What is the molarity of the solution?

Calculate the molality of a 25.0% by mass solution of MgCl₂ in H₂O. The density of this solution is 1.127 g/mL.

A solution is made by dissolving 1.25 moles of magnesium nitrate in 300.0 g of water. If the van't Hoff factor, i, for this particular concentration is 2.25, what is the expected freezing point of this solution? K_f = 1.86 °C m^-1.

9.92 grams of a compound with a molar mass of 124.0 grams/mole when dissolved in 150.0 grams of water gave a solution that had a freezing point of -2.69°C. Calculate the experimental value of the van't Hoff factor. K_f = 1.86 °C m^-1.

An aqueous solution of orthophosphoric acid, H₃PO₄, has a measured density of 1.2089 g mL^-1 and is 5.257 molal. How many moles of H₃PO₄ are there in one liter of this solution?

At 28.0°C, the vapor pressure of n-propyl mercaptan, C₃H₇SH, is 175 torr, while that of acetonitrile, CH₃CN, is 102 torr. What is the vapor pressure, at 28.0°C, of a solution made by mixing 100.0 g of C₃H₇SH and 100.0 g CH₃CN, if Raoult's Law is obeyed?

An aqueous solution of ethanol, C₂H₅OH, is 19.00% ethanol by mass and has a density of 0.9700 g mL^-1. Calculate the molality of the ethanol solution.

A solution of sodium nitrite is prepared by mixing 3.25 g of NaNO₂ with 12.0 g of water. The percent, by mass, of NaNO₂ is

A solution of sodium nitrate, NaNO₃, in water is 5.181 molar and its density is 1.2680 g mL^-1. Calculate the percent, by weight, of sodium nitrate in the solution.