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Why pure ethyl alcohol cannot be obtained from rectified spirit even by fractional distillation?
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Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at are and , respectively. What is the mole fraction of toluene in vapour phase when of benzene is mixed with of toluene?
(Molar mass of benzene and toluene are and , respectively)

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