A mixture containing equimolar amounts of benzene(1), toluene(2), and ethylbenzene(3) is flashed at a temperature of 383.15K, and a pressure of 90kPa. (i) Show that the system is in a 2-phase region. [6 marks] (ii) Show that the molar percent of vapour formed is 81.86. Determine the equilibrium of liquid and vapour phases. compositions [8 marks] Assuming truncated Virial equation applies to isobutylene gas at 280C and a moderate pressure of 10bar, estimate its fugacity and fugacity coefficient. ( For isobutylene, TC=417.9K,PC=40 bar and =0.194 ) [11 marks]