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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

`52 mol%`

B

`34 mol%`

C

`48mol%`

D

`50 mol%`

Text Solution

Verified by Experts

The correct Answer is:
D
At boiling point `P_(sys) = P_(sorr')`
`760 = 520 xx x_(A) + 1000 (1-x_(A))`
`x_(A) = (240)/(480) = 0.50` or `50%`
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