1.A solution is composed of benzene (B) and toluene (T). The Raoult’s law holds for both benzene and toluene. The equilibrium vapour pressures of benzene and toluene are 102.4kPa and 39.0kPa, respectively, at 81°C. Calculate the mole fraction of benzene in the vapour which is in equilibrium with the NB = 0.5 solution. Calculate the amount of heat associated with the formation of one mole of solution containiig 20mol% P.

1. The excess integral molar free energy of the Ga-P binary solution containing up to 50mol% P is Gfi = (-7.53 T – 2,500)NpNh, Jmol” Calculate the amount of heat associated with the formation of one mole of solution containiig 20mol% P.