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Question

Benzene and toluene form nearly ideal solutions. At 20, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20 for a solution containing 78g of benzene and 46g of toluene in torr is

A
50
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B
25
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C
37.5
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D
53.5
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Solution

The correct option is A 50

According to Rault's law-
PB=P0B×XB=75×78787878+4692=75×11+0.5=50 torr


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