1. A feed of 250 kmol/h of a benzene (more volatile)-hexane mixture at 50 mol% benzene is being separated in a distillation column to a 85 mol% benzene and bottoms is at 10 mol% benzene. Calculate the minimum number of stages, Nmin, and (L/D)min if the feed is a saturated liquid. If L/D = 2x(L/D) min, calculate the number of stages? The equilibrium diagram is attached. (There is a small but non- threatening pinch point in the last section)