Question

If the ratio of mole fraction of two components A and B in vapour phase is YA : YB = 2 : 3 and in the liquid phase is XA : XB = 3 : 2. Then the ratio of : is

Answer 1

Explanation:

the answer is 4:9.

given to us :Ya:Yb=2:3

Xa:Xb=3:2

Pa:Pb=?

there's a formula

Ya=PaXa/PaXa+PbXb

and Yb=PbXb/PaXa+PbXb

dividing Ya by Yb

Ya/Yb=PaXa/PbXb

now Ya/Yb=2/3

so PaxA/PbXb=2/3

also Xa/Xb=3/2

hence Pa/Pb=4:9