A stream of 100 kmol h 1 contains 0.4 mole fraction of benzene and 0.6 toluene. It is to be separated in a rectifying column, a column with a condenser, distillate withdrawal and liquid reflux return. There is no stripping section and no reboiler. The feed is introduced as a saturated vapour (a vapour at its boiling temperature) to the bottom stage and a liquid product is withdrawn from this plate. The distillate product contains 95 mole % benzene and the bottoms product has a benzene mole fraction XB. The column operates at 1 atmosphere total pressure. a) Determine the maximum and minimum values of XB b) Determine the number of stages required and the fraction of the feed benzene recovered in the distillate when XB takes the values 0.375, 0.3 and 0.25. Equilibrium data in terms of mole fraction benzene: 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.6 y* 0.0 0.21 0.37 0.51 0.63 0.72 0.79 0.86 0.92 0.96 1.6