The mole fraction of toluene in vapour phase which is in equilibrium with a solution of benzene and toluene having a mole fraction of toluene 0.500 is (vapour pressure of pure benzene and pure toluene are 119 torn and 37.0 torn respectively at the same temperature).

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0.5

0.763

0.237

answer is C.

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Detailed Solution

P=P0XB+P0XTP=119×0.5+37×0.5YT=PT0XTP=37×0.5119×0.5+37×0.5=0.237

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