14. Solutions

Vapor Pressure Lowering (Raoult's Law)

Multiple Choice
Given the following aqueous solutions at the same temperature, rank them from lowest to highest vapor pressure:A. 0.5 mol NaCl in 1.0 kg H2OB. 0.5 mol glucose (C6H12O6) in 1.0 kg H2OC. Pure H2OWhich sequence correctly ranks the solutions from lowest to highest vapor pressure?
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Multiple Choice
Which term best describes the pressure exerted by a saturated vapor above its own liquid in a closed container?
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Multiple Choice
Which of the following substances would have the highest vapor pressure at 298 K?
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Multiple Choice
Which of the following substances would you predict to have the highest enthalpy of vaporization (ΔH_{vap})?
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Multiple Choice
Which of the following compounds has the highest vapor pressure at 25 °C?
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Multiple Choice
A 0.100 m solution of which one of the following solutes in water will have the highest vapor pressure?
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Multiple Choice
A 0.200 m solution of which of the following solutes in water will have the lowest vapor pressure?
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Multiple Choice
How many grams of glucose, C₆H₁₂O₆, must be added to 515.0 g of water to give a solution with a vapor pressure of 13.2 torr at 20.0ºC? The vapor pressure of pure water at 20.0ºC is 17.5 torr.
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Multiple Choice
Determine the vapor pressure lowering associated with 1.32 m C₆H₁₂O₆ solution (MW:180.156 g/mol) at 25°C. The vapor pressure of pure water at 25°C is 23.8 torr.
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Multiple Choice
The vapor pressure of water at 100.0ºC is 0.720 atm. Determine the mass percent of iron (II) chloride, FeCl₂, needed to reduce its vapor pressure to 0.655 atm. (MW of FeCl₂ is 126.756 g/mol)
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Multiple Choice
What would be the vapor pressure at 25.0 °C of a solution of 5.00 g of glucose (C₆H₁₂O₆) in 100.0 g of ethanol (C₂H₅OH)? Pure ethanol has a vapor pressure of 54.68 mmHg at 25 °C.
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Multiple Choice
A KCl solution is prepared by dissolving 40.0 g KCl in 250.0 g of water at 25°C. What is the vapor pressure of the solution if the vapor pressure of pure water at 25°C is 23.76 mm Hg?
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Multiple Choice
A solution containing ethylene glycol and water has a vapor pressure of 7.88 torr at 10°C. Pure water has a vapor pressure of 9.21 torr at 10°C. What is the mole fraction of ethylene glycol in the solution?
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Multiple Choice
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 16.65% naphthalene by mass. Calculate the vapor pressure at 25°C of hexane above the solution. The vapor pressure of pure hexane at 25°C is 151 torr. What is the vapor pressure of hexane above the solution?
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Multiple Choice
A solution is prepared by dissolving 40.0 g of sucrose, C12H22O11, in 250. g of water at 25°C. What is the vapor pressure of the solution if the vapor pressure of pure water at 25°C is 23.76 mm Hg?
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