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Q.

The vapour pressure of pure liquid is 70 Torr at 27 °C. The vapour pressure of a solution of this liquid and another liquid (mole fraction 0.2) is 84 Torr at 27 °C. The vapour pressure of pure liquid Bat 27 °C is

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a

280 Torr

b

140 Torr

c

160 Torr

d

200 Torr

answer is A.

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Detailed Solution

$p = x_{A} p_{A}^{*} + x_{B} p_{B}^{*} \Rightarrow 84 Torr = (0.8) (70 Torr) + (0.2) (p_{B}^{*}) \Rightarrow p_{B}^{*} = 140 Torr$

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