Question

The vapour pressure of a pure liquid A is 60 torr at 300K. It forms an ideal solution with another liquid B. The mole fraction of B is 0.25 and the total pressure of the solution is 82.5 torr at 300K. The vapour pressure of pure liquid B at 300K is
A. 37.5
B. 150
C. 75
D. 187.5

Answer 1

Correct Answer - B
`82.5 = 60 xx 0.75 +x xx 0.5`or `x = 150` torr