Question

Calculate the vapor pressure of a solution containing 28.7g of glycerin (C3H8O3) in 136mL of water at 30.0 ∘C. The vapor pressure of pure water at this temperature is 31.8 torr. Assume that glycerin is not volatile and dissolves molecularly (i.e., it is not ionic) and use a density of 1.00 g/mL for the water.

Answer 1

mols glycerin = grams/molar mass = ?
mols H2O = grams/molar mass = ?
mols fraction glycerin = Xgly = mols glycerin/total mols.

Then pH2O = Xglycerin*P^o_H2O