Multiple Choice
What is it called when plants give off water vapor as a waste product?
14. Solutions
Vapor Pressure Lowering (Raoult's Law)
Back14. Solutions
Vapor Pressure Lowering (Raoult's Law)
- 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.
- 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.
- 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)
- Multiple ChoiceWhat 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.
- Multiple ChoiceA 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?
- Multiple ChoiceA 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?
- Multiple ChoiceA 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?
- Multiple ChoiceA 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?
- Multiple ChoiceA solution is prepared by dissolving 0.5 mol of a non-volatile solute in 1.0 mol of water. Calculate the vapor pressure of water above this solution at 338 K, given that the vapor pressure of pure water at this temperature is 0.2467 atm.
- Multiple ChoiceUsing Raoult's Law, calculate the vapor pressure of water at 50.0°C if the pure vapor pressure of water at this temperature is 12.3 kPa and a non-volatile solute is added to form a solution with a mole fraction of water of 0.8.
- Multiple ChoiceMethanol has a normal boiling point of 64.6°C and a heat of vaporization of 35.2 kJ/mol. What is the vapor pressure of methanol at 12.0°C?
- Multiple ChoiceThe colligative molality of seawater is approximately 1.10 m. Calculate the vapor pressure of seawater at 20 °C. The vapor pressure of pure water at 20 °C is 17.54 Torr. What is the vapor pressure of seawater?
- Multiple ChoiceThe normal boiling point of methanol is 64.7°C. A solution containing a nonvolatile solute dissolved in methanol has a vapor pressure of 417.0 torr at 64.7°C. What is the mole fraction of methanol in this solution?
- Multiple ChoiceUsing Raoult's Law, calculate the vapor pressure of SiCl4 at 33.5 °C given that its vapor pressure is 100 mm Hg at 5.4 °C and ΔHvap = 30.2 kJ/mol.