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A liquid mixture containing 30 mole% benzene, 25 mole% toluene, and 45 mole% xylene is fed at a rate of 1275 kmol h-1 to a distillation unit consisting of two columns. The bottoms product from the first column is to contain 99 mole% xylene and no benzene, and 98% of the xylene in the feed is to be recovered in this stream. The overhead product from the second column contains 99 mole% benzene and no xylene. The benzene recovered in this stream represents 96% of the benzene fed to this column. Calculate the molar flow rates (kmol h-?) and the component mole fractions in each product stream from both columns (25 marks)