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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

0.079 mol/kg of solvent

B

0.256 mol/kg of solvent

C

0.158 mol/kg of solvent

D

0.316 mol/kg of solvent

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The correct Answer is:
C
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