At 90^@C, the vapour pressure of toluene...

At `90^@C`, the vapour pressure of toluene is 400 torr and that of ` sigma`-xylene is 150 torr. What is the composition of the liquid mixture that boils at `90^@C`, when the pressure is 0.50 atm? What is the composition of vapour produced?

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The correct Answer is:

92 mol% toluene; 96.8 mol% toluene

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