(15 POINTS) DEW POINT PRESSURE CALCULATION: An acetone(1)/methanol(2) vapor mixture is at equilibrium with a liquid mixture composed of the same species. At 55C the vapor pressures are determined to be put = 97.2497 kPa, Paat = 68.3364 kPa. Furthermore, at 55C the activity coefficients of the species are 71 = exp(0.6423) and 72 = exp(0.64.c). Given that the composition of the vapor phase is 90 mole percent acetone and the rest methanol: (i) show that the composition of acetone in the liquid is 91.49 mole percent; and (ii) determine the dew point pressure for the system at equilibrium. Solution