# 2.36    of liquid A  was dissolved in of liquid B . The vapour pressure of pure liquid B was found to be Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure the solution is

For calculating partial vapour pressure we need to calculate mole fractions of components.

So number of moles of liquid A :

and  moles of liquid B :

Mole fraction of A (xA)   :

and mole fraction of B (xB)  :

Now,                    Ptotal  =  PA + PB

or

or

or

Thus vapour pressure in solution due to A =

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