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O.Te A simple distillation problem A very small amount of a non-volatile impunity is to be removed from a mixture of benzene and toluene by a distillation process, where the impurity is left in the boiler. The total amount of benzene and toluene is 40 mol and the mole fraction of benzene in this mixture is xx=0.32. The primitive distillation apparatus consists of a boiler, a condenser in which all vapor condenses, and a condensate storage vessel. Initially the boiler is charged with 20 mol of the benzene-toluene mixture, which is heated to its boiling point without allowing any vapor to escape. When the boiling point is reached at time 1 = 0 two valves are opened, such that vapor escapes to the condenser at a rate of 10 mol/hr while fresh mixture at the boiling point is supplied to the boiler, also at a rate of 10 mol/hr. The relationship between the vapor mole fraction yo of benzene in equilibrium with a liquid with benzene mole fraction vis 2 [1.4x, +0.1 0.15