Determine the molal concentration of a table sugar (C12H22O11, 342.3 g/mol) solution in water that has a freezing point of -2.10$\degree$C.(Kf =1.86$\degree$C/m for water)

A) 1.13 m B) (-1.13 m) C) 3.91 m D) (-3.91 m) E) 0.113 m A) 1.13 m B) (-1.13 m) C) 3.91 m D) (-3.91 m) E) 0.113 m

Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the properties of isooctane (C8H18), which has an enthalpy of vaporization of 35.8 kJ/mol and a normal boiling point of 98.2 $\degree$C.Determine the vapor pressure of isooctane on a very hot day when the temperature is 38.0 $\degree$C.

A) 80.6 torr B) 36.7 torr C) 67.8 torr D) 47.9 torr E) 89.3 torr A) 80.6 torr B) 36.7 torr C) 67.8 torr D) 47.9 torr E) 89.3 torr

What is the freezing point of an aqueous solution prepared by dissolving 113 g of sodium phosphate (Na3PO4, 163.94 g/mol) in 2.50 kg of water? Use the ideal van 't Hoff factor.(Kf (water) =1.86$\degree$C/m)

The answer of What is the freezing point of an...

What is the boiling point of a solution prepared by dissolving 10.00 g of naphthalene (C10H8, 128.17 g/mol) in 200.0 g of benzene (C6H6, 78.12 g/mol)? The normal boiling point of benzene is 80.1$\degree$C and Kb =2.53$\degree$C/m.

A) 79.1$\degree$C B) 81.1$\degree$C C) 80.5$\degree$C D) 86.6$\degree$C E) 101.0$\degree$C A) 79.1$\degree$C B) 81.1$\degree$C C) 80.5$\degree$C D) 86.6$\degree$C E) 101.0$\degree$C

How many grams of potassium nitrate (KNO3) must be added to 450.0 g of water to produce a 1.30 m solution?

A) 35.0 g B) 59.1 g C) 131 g D) 292 g E) 5.91* 104 g A) 35.0 g B) 59.1 g C) 131 g D) 292 g E) 5.91* 104 g

Exam 11: Properties of Solutions Their Concentrations and Colligative Properties

Determine the molal concentration of a table sugar (C₁₂H₂₂O₁₁, 342.3 g/mol) solution in water that has a freezing point of -2.10 $\degree$ C.(K_f =1.86 $\degree$ C/m for water)

(Multiple Choice)

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Question 21

The smell of fresh-cut pine is due in part to a cyclic alkene called pinene.A graph of the natural logarithm of the vapor pressure of pinene vs.1/temperature produces a straight line with a slope of -4936.37 K.What is the enthalpy of vaporization of pinene?

(Multiple Choice)

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Question 22

Drinking seawater is dehydrating to humans because

(Multiple Choice)

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Question 23

Gasoline is primarily a mixture of hydrocarbons and is sold with an octane rating that is based on a comparison with the properties of isooctane (C₈H₁₈), which has an enthalpy of vaporization of 35.8 kJ/mol and a normal boiling point of 98.2 $\degree$ C.Determine the vapor pressure of isooctane on a very hot day when the temperature is 38.0 $\degree$ C.

(Multiple Choice)

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Question 24

What is the freezing point of an aqueous solution prepared by dissolving 113 g of sodium phosphate (Na₃PO₄, 163.94 g/mol) in 2.50 kg of water? Use the ideal van 't Hoff factor.(K_f (water) =1.86 $\degree$ C/m)

(Short Answer)

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Question 25

What is the boiling point of a solution prepared by dissolving 10.00 g of naphthalene (C₁₀H₈, 128.17 g/mol) in 200.0 g of benzene (C₆H₆, 78.12 g/mol)? The normal boiling point of benzene is 80.1 $\degree$ C and K_b =2.53 $\degree$ C/m.

(Multiple Choice)

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Question 26

Which of the following statements regarding solubility of gases in liquids is NOT correct?

(Multiple Choice)

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Question 27

Does the temperature of the vapors in a still head increase or decrease as a fractional distillation progresses? Explain.

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Question 28

Water contains about 42 mg of oxygen per liter at 20 $\degree$ C and 1 atm.What is the Henry's law constant for oxygen dissolving in water?

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Question 29

A 275 mg sample of a nonelectrolyte compound was dissolved in water to produce 10.0 mL of a solution at 25 $\degree$ C.The osmotic pressure of this solution was measured and found to be 3.67 atm.What is the molar mass of this compound?

(Multiple Choice)

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Question 30

The arrow in the diagram below indicates the direction of solvent flow through a membrane in osmosis.Which solution, A or B, is more concentrated? Explain your reasoning.

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Question 31

Calculate the molality of a solution containing 0.575 mol of ethanol (CH₃CH₂OH) and 395 g of water.

(Multiple Choice)

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Question 32

A solution contains 6.50 mol of water, 0.300 mol of sucrose, and 0.200 mol of glucose.The solutes are nonvolatile.What is the vapor pressure of the solution at 35 $\degree$ C given that the vapor pressure of water is 42.2 torr?

(Multiple Choice)

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Question 33

Calculate the minimum pressure that must be applied to achieve reverse osmosis of 0.320 M KBr at 25.0 $\degree$ C.

(Multiple Choice)

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Question 34

A solution contains two isomers, n-propyl alcohol and isopropyl alcohol, at 25 $\degree$ C.The total vapor pressure is 38.6 torr.What are the mole fractions of each alcohol in the liquid and in the vapor phase? The vapor pressures are 21.0 torr for n-propyl alcohol and 45.2 torr for isopropyl alcohol.

(Essay)

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Question 35

The aroma from almonds and cherries is due in part to a compound called benzaldehyde.A graph of the natural logarithm of the vapor pressure of benzaldehyde vs.1/temperature produces a straight line with a slope of -5870.99 K.What is the enthalpy of vaporization of benzaldehyde?

(Multiple Choice)

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Question 36

Which of the following solutions is isotonic with the solution inside a red blood cell, which has an osmotic pressure of 7.89 atm at 37.0 $\degree$ C?

(Multiple Choice)

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Question 37

Which solution will have the lowest osmotic pressure when measured against pure water?

(Multiple Choice)

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Question 38

How many grams of potassium nitrate (KNO₃) must be added to 450.0 g of water to produce a 1.30 m solution?

(Multiple Choice)

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Question 39

Indicate which aqueous solution has the slowest evaporation rate.

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Question 40

Showing 21 - 40 of 130

Exam 11: Properties of Solutions Their Concentrations and Colligative Properties

Determine the molal concentration of a table sugar (C12H22O11, 342.3 g/mol) solution in water that has a freezing point of -2.10 °\degree° C.(Kf =1.86 °\degree° C/m for water)

The smell of fresh-cut pine is due in part to a cyclic alkene called pinene.A graph of the natural logarithm of the vapor pressure of pinene vs.1/temperature produces a straight line with a slope of -4936.37 K.What is the enthalpy of vaporization of pinene?

Drinking seawater is dehydrating to humans because

What is the freezing point of an aqueous solution prepared by dissolving 113 g of sodium phosphate (Na3PO4, 163.94 g/mol) in 2.50 kg of water? Use the ideal van 't Hoff factor.(Kf (water) =1.86 °\degree° C/m)

What is the boiling point of a solution prepared by dissolving 10.00 g of naphthalene (C10H8, 128.17 g/mol) in 200.0 g of benzene (C6H6, 78.12 g/mol)? The normal boiling point of benzene is 80.1 °\degree° C and Kb =2.53 °\degree° C/m.

Which of the following statements regarding solubility of gases in liquids is NOT correct?

Does the temperature of the vapors in a still head increase or decrease as a fractional distillation progresses? Explain.

Water contains about 42 mg of oxygen per liter at 20 °\degree° C and 1 atm.What is the Henry's law constant for oxygen dissolving in water?

A 275 mg sample of a nonelectrolyte compound was dissolved in water to produce 10.0 mL of a solution at 25 °\degree° C.The osmotic pressure of this solution was measured and found to be 3.67 atm.What is the molar mass of this compound?

The arrow in the diagram below indicates the direction of solvent flow through a membrane in osmosis.Which solution, A or B, is more concentrated? Explain your reasoning.

Calculate the molality of a solution containing 0.575 mol of ethanol (CH3CH2OH) and 395 g of water.

A solution contains 6.50 mol of water, 0.300 mol of sucrose, and 0.200 mol of glucose.The solutes are nonvolatile.What is the vapor pressure of the solution at 35 °\degree° C given that the vapor pressure of water is 42.2 torr?

Calculate the minimum pressure that must be applied to achieve reverse osmosis of 0.320 M KBr at 25.0 °\degree° C.

The aroma from almonds and cherries is due in part to a compound called benzaldehyde.A graph of the natural logarithm of the vapor pressure of benzaldehyde vs.1/temperature produces a straight line with a slope of -5870.99 K.What is the enthalpy of vaporization of benzaldehyde?

Which of the following solutions is isotonic with the solution inside a red blood cell, which has an osmotic pressure of 7.89 atm at 37.0 °\degree° C?

Which solution will have the lowest osmotic pressure when measured against pure water?

How many grams of potassium nitrate (KNO3) must be added to 450.0 g of water to produce a 1.30 m solution?

Indicate which aqueous solution has the slowest evaporation rate.

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Determine the molal concentration of a table sugar (C₁₂H₂₂O₁₁, 342.3 g/mol) solution in water that has a freezing point of -2.10 $\degree$ C.(K_f =1.86 $\degree$ C/m for water)

What is the freezing point of an aqueous solution prepared by dissolving 113 g of sodium phosphate (Na₃PO₄, 163.94 g/mol) in 2.50 kg of water? Use the ideal van 't Hoff factor.(K_f (water) =1.86 $\degree$ C/m)

What is the boiling point of a solution prepared by dissolving 10.00 g of naphthalene (C₁₀H₈, 128.17 g/mol) in 200.0 g of benzene (C₆H₆, 78.12 g/mol)? The normal boiling point of benzene is 80.1 $\degree$ C and K_b =2.53 $\degree$ C/m.

Water contains about 42 mg of oxygen per liter at 20 $\degree$ C and 1 atm.What is the Henry's law constant for oxygen dissolving in water?

A 275 mg sample of a nonelectrolyte compound was dissolved in water to produce 10.0 mL of a solution at 25 $\degree$ C.The osmotic pressure of this solution was measured and found to be 3.67 atm.What is the molar mass of this compound?

Calculate the molality of a solution containing 0.575 mol of ethanol (CH₃CH₂OH) and 395 g of water.

A solution contains 6.50 mol of water, 0.300 mol of sucrose, and 0.200 mol of glucose.The solutes are nonvolatile.What is the vapor pressure of the solution at 35 $\degree$ C given that the vapor pressure of water is 42.2 torr?

Calculate the minimum pressure that must be applied to achieve reverse osmosis of 0.320 M KBr at 25.0 $\degree$ C.

Which of the following solutions is isotonic with the solution inside a red blood cell, which has an osmotic pressure of 7.89 atm at 37.0 $\degree$ C?

How many grams of potassium nitrate (KNO₃) must be added to 450.0 g of water to produce a 1.30 m solution?