Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 17.3 g of biphenyl in 34.0 g of benzene?

Answer 1

mols biphenyl = grams/molar mass
mol benzene = grams/molar mass
Xbenzene = nbenzene/total mols.

Pbenzenesoln = Xbenzene*P^o_benzene