glycerin C3H8O is a nonvolatile liquid. what is the vapor pressure of a solution made by adding 164 g of glycerin to 338 mL of H2O at 39.8C. The vapor pressure of pure water at 39.8C is 54.74 torr and its density is 0.992 g/cm3

P solution= X solvent p solvent

1.78g C3H8O3

1 answer

Use density to calculate mass H2O.
mass = volume x density.

Calculate mole fraction H2O
n H2O = grams/molar mass
n glycerin = grams/molar mass
ntotal = n H2O + n glycerin

XH2O = n H2O/n total

psoln = XH2O*PoH2O

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