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The vapour pressure of pure benzene is 6...

The vapour pressure of pure benzene is `639.7 mm Hg` and the vapour pressure of solution of a solute in benzene at the temperature is `631.9 mm Hg`. Calculate the molality of the solution.

A

`0.156`

B

`0.108`

C

`5.18`

D

`0.815`

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A
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