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The vapour pressure of benzene at 90^(@)...

The vapour pressure of benzene at `90^(@)C` is `1020` torr. A solution of `5 g` of a solute in `58.5 g` benzene has vapour pressure `990` torr. The molecualr weight of the solute is:

A

`78.1`

B

`178.25`

C

`206.1`

D

`220`

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The correct Answer is:
D
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