Exercise 6 | Colligative Properties of Solutions
The vapor pressure of pure water at 65oC is 412 torr.
What is the vapor pressure at 65oC of a solution prepared from 100 mL of water (density 1.00 g/mL) and 120 g of diglyme, C6H14O3, a nonvolatile substance?
Pwater = xwater P0water
Pwater = vapor pressure of the water in the solution
xwater = mole fraction of water in the solution
P0water = vapor pressure of the pure water
nwater = = = 5.55 mol
ndiglyme = = = 0.894 mol
xwater = = 0.861
Pwater = xwater P0water = 0.861 x 412 = 355 torr