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The vapour pressure of pure benzene is 639.7 mm of mercury and the vapour pressure of solution of a solute in

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

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Given, 

Vapour pressure of pure benzene(p°)= 639.7mm of Hg. 

Vapour pressure of solution ( p ) = 63 1 .9mm of Hg 

According to Raoult's law

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