Question
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
P solution= X solvent p solvent
1.78g C3H8O3
Answers
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
p<sub>soln</sub> = X<sub>H2O</sub>*P<sup>o</sup><sub>H2O</sub>
Post your work if you get stuck.
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
p<sub>soln</sub> = X<sub>H2O</sub>*P<sup>o</sup><sub>H2O</sub>
Post your work if you get stuck.