Calculate the molality of C2H5OH in a water solution that is prepared by mixing 50.0 mL of C2H5OH with 100.0 mL of H2O at 20°C. The density of the C2H5OH is 0.789 g/mL at 20°C.

A) 1.24 m B) 0.086 m C) 8.56 m D) 0.094 m E) none of these A) 1.24 m B) 0.086 m C) 8.56 m D) 0.094 m E) none of these

When 200.0 mL of 0.200 M H2SO4 is diluted with 155.0 mL of water, what is the molarity of the solution?

A) 0.258 M B) 0.155 M C) 0.124 M D) 0.113 M E) none of these A) 0.258 M B) 0.155 M C) 0.124 M D) 0.113 M E) none of these

When a 1.50-g sample of glutamic acid is dissolved in 100.0 g of H2O, the resulting solution freezes at -0.190°C. Kf for H2O is 1.86°C/m. The molar mass of glutamic acid is

A) 28.0 g/mol B) 147 g/mol C) 1.50 g/mol D) 189 g/mol E) 14.7 g/mol A) 28.0 g/mol B) 147 g/mol C) 1.50 g/mol D) 189 g/mol E) 14.7 g/mol

Exam 17: Properties of Solutions

Calculate the molality of C₂H₅OH in a water solution that is prepared by mixing 50.0 mL of C₂H₅OH with 100.0 mL of H₂O at 20°C. The density of the C₂H₅OH is 0.789 g/mL at 20°C.

(Multiple Choice)

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Question 21

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 22

50.0g of pure sand (silica) is poured into 1 L of water where it immediately sinks to the bottom and remains undissolved. Which of the following is true?

(Multiple Choice)

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Question 23

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?

(Multiple Choice)

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Question 24

The molar mass of a solid as determined by freezing-point depression is 10% higher than the true molar mass. Which of the following experimental errors could not account for this discrepancy?

(Multiple Choice)

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Question 25

An aqueous solution contains 171.2 g of NaCl per liter. What is the molarity of the solution?

(Multiple Choice)

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Question 26

The boiling point of pure benzene at 760. torr is 80.1°C. What is the vapor pressure of benzene over a solution containing 4.40 mol of nonvolatile hydrocarbon and 11.80 mol of benzene at 80.1°C?

(Multiple Choice)

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Question 27

Using the data below, calculate the vapor pressure of chloroform 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.

(Multiple Choice)

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Question 28

When 200.0 mL of 0.200 M H₂SO₄ is diluted with 155.0 mL of water, what is the molarity of the solution?

(Multiple Choice)

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Question 29

For each of the following solutions, would you expect it with respect to Raoult's law) to be relatively ideal, to show a positive deviation, or to show a negative deviation? -hexane (C₆H₁₄) and chloroform (CHCl₃)

(Multiple Choice)

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Question 30

What is the percentage by mass of glycerol (C₃H₅(OH)₃) in a 1.5 m solution?

(Short Answer)

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Question 31

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 32

Determine the molarity of a solution containing 2.00 g of sodium hydroxide in 250.0 mL of solution.

(Short Answer)

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Question 33

When 1 mol of a nonvolatile solvent-nondissociating substance is dissolved in 3 mol of solvent, the ratio of vapor pressure of the solution to that of the pure solvent (at the same temperature) is approximately

(Multiple Choice)

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Question 34

Calculate the mole fraction of C₁₂H₂₂O₁₁ in a solution prepared by dissolving 250.0 g of C₁₂H₂₂O₁₁ in 1.00 kg of H₂O.

(Short Answer)

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Question 35

Solid KF has a lattice energy of -804 kJ/mol and a heat of solution (in water) of -15 kJ/mol. RbF has a lattice energy of -768 kJ/mol and a heat of solution (in water) of -24 kJ/mol. Which salt forms stronger attractions with water?

(Multiple Choice)

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Question 36

A chemist is given a white solid that is suspected of being pure cocaine. When 1.22 g of the solid is dissolved in 15.60 g of benzene, the freezing point is lowered by 1.32°C. Calculate the molar mass of the solid. The molal freezing-point constant (K_f) for benzene is 5.12°C/m.

(Essay)

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Question 37

At a given temperature, you have a mixture of benzene (vapor pressure of pure benzene = 745 torr) and toluene (vapor pressure of pure toluene = 290 torr). The mole fraction of benzene in the vapor above the solution is 0.590. Assuming ideal behavior, calculate the mole fraction of toluene in the solution.

(Multiple Choice)

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Question 38

For each of the following solutions, would you expect it with respect to Raoult's law) to be relatively ideal, to show a positive deviation, or to show a negative deviation? -hexane (C₆H₁₄) and octane (C₈H₁₈)

(Multiple Choice)

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Question 39

When a 1.50-g sample of glutamic acid is dissolved in 100.0 g of H₂O, the resulting solution freezes at -0.190°C. K_f for H₂O is 1.86°C/m. The molar mass of glutamic acid is

(Multiple Choice)

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Question 40

Showing 21 - 40 of 105

Calculate the molality of C₂H₅OH in a water solution that is prepared by mixing 50.0 mL of C₂H₅OH with 100.0 mL of H₂O at 20°C. The density of the C₂H₅OH is 0.789 g/mL at 20°C.

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?

50.0g of pure sand (silica) is poured into 1 L of water where it immediately sinks to the bottom and remains undissolved. Which of the following is true?

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?

The molar mass of a solid as determined by freezing-point depression is 10% higher than the true molar mass. Which of the following experimental errors could not account for this discrepancy?

An aqueous solution contains 171.2 g of NaCl per liter. What is the molarity of the solution?

The boiling point of pure benzene at 760. torr is 80.1°C. What is the vapor pressure of benzene over a solution containing 4.40 mol of nonvolatile hydrocarbon and 11.80 mol of benzene at 80.1°C?

Using the data below, calculate the vapor pressure of chloroform 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.

When 200.0 mL of 0.200 M H₂SO₄ is diluted with 155.0 mL of water, what is the molarity of the solution?

For each of the following solutions, would you expect it with respect to Raoult's law) to be relatively ideal, to show a positive deviation, or to show a negative deviation? -hexane (C₆H₁₄) and chloroform (CHCl₃)

What is the percentage by mass of glycerol (C₃H₅(OH)₃) in a 1.5 m solution?

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

Determine the molarity of a solution containing 2.00 g of sodium hydroxide in 250.0 mL of solution.

When 1 mol of a nonvolatile solvent-nondissociating substance is dissolved in 3 mol of solvent, the ratio of vapor pressure of the solution to that of the pure solvent (at the same temperature) is approximately

Calculate the mole fraction of C₁₂H₂₂O₁₁ in a solution prepared by dissolving 250.0 g of C₁₂H₂₂O₁₁ in 1.00 kg of H₂O.

Solid KF has a lattice energy of -804 kJ/mol and a heat of solution (in water) of -15 kJ/mol. RbF has a lattice energy of -768 kJ/mol and a heat of solution (in water) of -24 kJ/mol. Which salt forms stronger attractions with water?

A chemist is given a white solid that is suspected of being pure cocaine. When 1.22 g of the solid is dissolved in 15.60 g of benzene, the freezing point is lowered by 1.32°C. Calculate the molar mass of the solid. The molal freezing-point constant (K_f) for benzene is 5.12°C/m.

For each of the following solutions, would you expect it with respect to Raoult's law) to be relatively ideal, to show a positive deviation, or to show a negative deviation? -hexane (C₆H₁₄) and octane (C₈H₁₈)

When a 1.50-g sample of glutamic acid is dissolved in 100.0 g of H₂O, the resulting solution freezes at -0.190°C. K_f for H₂O is 1.86°C/m. The molar mass of glutamic acid is

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Exam 17: Properties of Solutions

Calculate the molality of C2H5OH in a water solution that is prepared by mixing 50.0 mL of C2H5OH with 100.0 mL of H2O at 20°C. The density of the C2H5OH is 0.789 g/mL at 20°C.

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?

50.0g of pure sand (silica) is poured into 1 L of water where it immediately sinks to the bottom and remains undissolved. Which of the following is true?

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?

The molar mass of a solid as determined by freezing-point depression is 10% higher than the true molar mass. Which of the following experimental errors could not account for this discrepancy?

An aqueous solution contains 171.2 g of NaCl per liter. What is the molarity of the solution?

The boiling point of pure benzene at 760. torr is 80.1°C. What is the vapor pressure of benzene over a solution containing 4.40 mol of nonvolatile hydrocarbon and 11.80 mol of benzene at 80.1°C?

Using the data below, calculate the vapor pressure of chloroform 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.

When 200.0 mL of 0.200 M H2SO4 is diluted with 155.0 mL of water, what is the molarity of the solution?

For each of the following solutions, would you expect it with respect to Raoult's law) to be relatively ideal, to show a positive deviation, or to show a negative deviation? -hexane (C6H14) and chloroform (CHCl3)

What is the percentage by mass of glycerol (C3H5(OH)3) in a 1.5 m solution?

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

Determine the molarity of a solution containing 2.00 g of sodium hydroxide in 250.0 mL of solution.

When 1 mol of a nonvolatile solvent-nondissociating substance is dissolved in 3 mol of solvent, the ratio of vapor pressure of the solution to that of the pure solvent (at the same temperature) is approximately

Calculate the mole fraction of C12H22O11 in a solution prepared by dissolving 250.0 g of C12H22O11 in 1.00 kg of H2O.

Solid KF has a lattice energy of -804 kJ/mol and a heat of solution (in water) of -15 kJ/mol. RbF has a lattice energy of -768 kJ/mol and a heat of solution (in water) of -24 kJ/mol. Which salt forms stronger attractions with water?

A chemist is given a white solid that is suspected of being pure cocaine. When 1.22 g of the solid is dissolved in 15.60 g of benzene, the freezing point is lowered by 1.32°C. Calculate the molar mass of the solid. The molal freezing-point constant (Kf) for benzene is 5.12°C/m.

For each of the following solutions, would you expect it with respect to Raoult's law) to be relatively ideal, to show a positive deviation, or to show a negative deviation? -hexane (C6H14) and octane (C8H18)

When a 1.50-g sample of glutamic acid is dissolved in 100.0 g of H2O, the resulting solution freezes at -0.190°C. Kf for H2O is 1.86°C/m. The molar mass of glutamic acid is

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Applications of Aqueous Equilibria

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Quantum Mechanics and Atomic Theory

Bonding: General Concepts

Covalent Bonding: Orbitals

Chemical Kinetics

Liquids and Solids

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Transition Metals and Coordination Chemistry

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Calculate the molality of C₂H₅OH in a water solution that is prepared by mixing 50.0 mL of C₂H₅OH with 100.0 mL of H₂O at 20°C. The density of the C₂H₅OH is 0.789 g/mL at 20°C.

Using the data below, calculate the vapor pressure of chloroform 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.

When 200.0 mL of 0.200 M H₂SO₄ is diluted with 155.0 mL of water, what is the molarity of the solution?

For each of the following solutions, would you expect it with respect to Raoult's law) to be relatively ideal, to show a positive deviation, or to show a negative deviation? -hexane (C₆H₁₄) and chloroform (CHCl₃)

What is the percentage by mass of glycerol (C₃H₅(OH)₃) in a 1.5 m solution?

Calculate the mole fraction of C₁₂H₂₂O₁₁ in a solution prepared by dissolving 250.0 g of C₁₂H₂₂O₁₁ in 1.00 kg of H₂O.

A chemist is given a white solid that is suspected of being pure cocaine. When 1.22 g of the solid is dissolved in 15.60 g of benzene, the freezing point is lowered by 1.32°C. Calculate the molar mass of the solid. The molal freezing-point constant (K_f) for benzene is 5.12°C/m.

For each of the following solutions, would you expect it with respect to Raoult's law) to be relatively ideal, to show a positive deviation, or to show a negative deviation? -hexane (C₆H₁₄) and octane (C₈H₁₈)

When a 1.50-g sample of glutamic acid is dissolved in 100.0 g of H₂O, the resulting solution freezes at -0.190°C. K_f for H₂O is 1.86°C/m. The molar mass of glutamic acid is