Question

Liquids A and B form an ideal solution. At a certain temperature the total vapour pressure of a mixture of
A and B is 400 mm. The mole fraction of A in the liquid mixture in equilibrium
with the vapour phase is 0.4
If the vapour pressure ratio (Pà/P.b) for the pure liquids at this temperature is 1/6, what is the partial
pressure of A in the vapour phase?
(A) 50mm
(B) 60mm
(C) 70mm
(D) 40mm​

Answer 1

Answer:

Correct option is

(B)

60mm

Answer 2

Answer:

Pressure of A in the vapour phase is 60mm