A still is charged with 25 mol of a mixture of benzene and toluene containing 0.35 mole
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A still is charged with 25 mol of a mixture of benzene and toluene containing 0.35 mole fraction benzene. Feed of the same composition is supplied at a rate of 7 mol/h, and the heat rate is adjusted so that the liquid level in the still remains constant. No liquid leaves the still pot, and α = 2.5. How long will it be before the distillate composition falls to 0.45 mole fraction benzene?
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