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At 80^(@)C, the vapour pressure of pure ...

At `80^(@)C`, the vapour pressure of pure benzene is `753 mm Hg` and of pure toluene `290 mm Hg`. Calculate the composition of a liquid in mole per cent which at `80^(@)C` is in equilibrium with the vapour containing `30` mole per cent of benzene.

A

`34` mol percent

B

`48` mol percent

C

`50` mol percent

D

`52` mol percent

Text Solution

Verified by Experts

The correct Answer is:
C
`P_("total")=P_(A)^(@)x_(A)+P_(B)^(@)x_(A)`
`760=520x_(A)+1000(1-x_(A))`
`760=520x_(A)+1000-1000x_(A)`
`x_(A)=0.5`
mol `%=50%`
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