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A liquid mixture of benzene and toluene ...

A liquid mixture of benzene and toluene is composed of `1 mol` of benzene and `1 mol` of toluence.
If the pressure over the mixture at `300 K` is reduced, at what pressure does the first vapour form?
Given:`p_(T)@ = 32.05 mm Hg , p_(B)@ = 103 mm Hg`

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The correct Answer is:
(a) `70mmHg` (b) `Y_(A)=2//7,Y_(B)=5//7` (c) `P=400//7=57.14mm` (d) `X_(A)=(5)/(7),X_(B)=(2)/(7)` (e) `63.25 mm` (liquid composition `0.3875,06125`) (vapour composition `0.6125,0.3875`)
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