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3. A mixture of benzene and p-xylene is batch-distilled at atmospheric pressure. The rate of heat input to the still is 4000kcal/hr. Individual heats of vaporization are: benzene =100kcal/kg, pxylene =85kcal/kg and the relative volatility of benzene in the mixture is 5.6. Calculate the instantaneous rate of vaporization of p xylene when the liquid in the still has 40mole% benzene in it