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The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

Vinay

As we know that:

of

As Raoult’s law says:

Hence, total pressure,

Hence,

Now,

of

Now, in the vapour phase: Mole fraction of liquid

And, mole fraction of liquid