1. What is the total vapor pressure at 20.0 *C of a liquid solution containing b

Question

1. What is the total vapor pressure at 20.0 *C of a liquid solution containing benzene and toluene? The mole fraction of benzene is 0.750. Assume that Raoult's law holds for each component of the solution. The vapor pressure of pure benzene at 20.0 *C is 75.0 torr, and that of toluene at 20.0 *C is 22.0 torr. (Mixture of two volatile components)

2. What is the boiling point and freezing point of a solution containing 0.500 g of gallium chloride in 100.0 g of water? The molal freezing point constant for water is 1.86 *C/m, and the molal boiling point constant for water is 0.51 *C/m. (Assume the gallium chloride is completely soluble and use the theoretical van't Hoff factor in your calculations.)

Explanation / Answer

p ( benzene) = 75 x 0.27 = 20.25 torr
p( toluene) = 22 x 0.73 = 16.06

p = 20.25 + 16.06 = 36.3 torr

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