# At the vapour pressure of pure liquid  A is 520 mm of and that of pure liquid B is 1000  mm of  . If a mixture solution of  A and B boils at and 1 atm pressure, the amount of  A in  the mixture is Option 1) Option 2) Option 3) Option 4)

As we learnt in

Rault's Law -

The total vapour pressure of binary mixture of miscible liquids be having ideally is given by

Where   and  are mole fraction of A and B in liquid phase.

- wherein

and are vapour pressures of pure liquids.

Given that

Let mole fraction of  & Molefraction of  at Boiling point the total pressure P is 760 mm Hg

or 50 mole percent.

Correct option is 1.

Option 1)

This is the correct option.

Option 2)

This is an incorrect option.

Option 3)

This is an incorrect option.

Option 4)

This is an incorrect option.

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