Boiling Point, Dew Point, and Flash Vaporization. Following is the composition of a liquid feed in mole fraction: n-butane (xA -0.35), n-pentane (Kg = 0.20), n-hexane, (xc = 0.25), n-heptane (XD = 0.20). At a pressure of 405.3 kPa calculate the following. 

(a) Boiling point and composition of the vapor in equilibrium 

(b) Dew point and composition of the liquid in equilibrium 

(c) The temperature and composition of both phases when 60% of the feed is vaporized in a flash distillation.