biphenyl C12H10 is a nonvolatile nonionizing solute that is

biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 degree C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 17.8 g of biphenyl in 31.4 g of benzene?

Solution

moles of biphenyl=17.8/154

=0.11558

moles of benzene=31.4/78

=0.40256

so pressure of benzene=0.40256*100.84/(0.40256+0.11558)

=78.3459 torr