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Benzene and toluene form nearly ideal so...

Benzene and toluene form nearly ideal solution. At `20^(@)C` the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at `20^(@)C` for a solution containing 78g of benzene and 46 g of toluene in torr is-

A

25

B

50

C

`53.5`

D

`37.5`

Text Solution

Verified by Experts

The correct Answer is:
B
Benzene: A, Tolvene: B
`X_(A) = (1)/(1+0.5) = (1)/(3//2) = (2)/(3)`
`P_(A) = P_(A)^(@) X_(A) = 75 xx (2)/(3) = 50` torr
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