At 40oC, the vapour pressure of pure liquids,benzene and toluene, are 160 mmHg and 60 mmHg respectively. At the same temperature, the vapour pressure of an equimolar solution of the two liquids, assuming the ideal solution should be

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140 mmHg

110 mmHg

220 mmHg

100 mmHg

answer is B.

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Detailed Solution

For ideal solution, ptotal =p1∘x1+p2∘x2 =160×12+60×12=110mmHg

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