1propanol P1 Solution First use the mole fractions of each l

Solution

First, use the mole fractions of each liquid to calculate the partial pressure of that component:

1-propanol: vapor pressure = 20.9 torr X 0.350 = 7.315 torr
2-propanol: vapor pressure = 45.2 torr X 0.650 = 29.38 torr

Mole fraction 1-propanol in vapor: 7.315 / (7.315+29.38) = 0.199
Mole fraction 2-propanol in vapor = 1-0.199 = 0.801