A benzene solution of a nonvolatile solute exhibits a vapor pressure of 90.5 torr at 25 degree C. The vapor pressure of benzene at 25 degree C is 93.9 torr.. what is the mole fraction of the solute in this solution?
Pbenzene = Xbenzene*Pobenzene
Then mole fraction solute = 1-mole fraction benzene.