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An equimolar mix of benzene & toluene is...

An equimolar mix of benzene `&` toluene is prepared the total V.P. of this mix as a fraction of mole fraction of benzene is found to be `P_(T)=200+400X_(ben)`.
(a) Calculate composition of vapours of this mix. [Assume that the no. of moles going into vapour phase is negligible in comparsion to no. of moles present in liq. phase].
(b) If the vapour above liq in part `A` are collected `&` are condensed into a new liquid calculate composition of vapours of this new liq.

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