. A liquid mixture of Benzene (C6H6) and n-Decane (C10H22) (xb = 0.55 kg/kg) is to be partially evaporated in a batch still. The vapour is condensed to produce a liquid mixture containing 85% Benzene and the residual liquid in the still contains 10.6% Benzene by mass. (i) Calculate the average molecular mass of the initial charge to the still. (ii) If 20 kmol of the mixture are initially charged to the still, determine the masses of the final product streams. (iii) Express