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For a binary liquid solution of A and B, the mole fraction of A in liquid and vapour phases are 0.70 and 0.35 at 600 Torr external pressure. The vapour pressure of A and B, respectively, are

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950 Torr and 450 Torr

450 Torr and 950 Torr

300 Torr and 1300 Torr

1300 Torr and 300 Torr

answer is D.

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Detailed Solution

We have $y_{A} = \frac{p_{A}}{p_{total}} = \frac{x_{A} p_{A}^{*}}{p_{total}} \Rightarrow p_{A}^{*} = \frac{y_{A} p_{toal}}{x_{A}}$

Thus

$p_{A}^{*} = \frac{(0.35) (600 Torr)}{(0.70)} = 300 Torr Similarly, p_{B}^{*} = \frac{y_{B} p_{total}}{x_{B}} = \frac{(0.65) (600 Torr)}{(0.30)} = 1300 Torr$

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