Question

Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 170 g of glycerin to 337 mL of H2O at 40.0°C?

The vapor pressure of pure water at 40.0°C is 55.32 torr and its density is 0.992 g/cm3.

Answer 1

mass water = 347 x 0.992 = 344.2 g

moles water = 344.2 g / 18.02 g/mol= 19.1

moles C3H8O3 = 164 g / 92.097 g/mol= 1.78

mole fraction water = 19.1 / 19.1 + 1.78 = 0.915

p = 0.915 x 54.74 = 50.07 torr

Step-by-step explanation: