two liquids A and B have vapour pressure in the ratio 2:3 at a certain temperature Assuming that A - Chemistry - Solutions

Question

two liquids A and B have vapour pressure in the ratio 2:3 at a
certain temperature Assuming that A and B forms an ideal solution
and ratio of mole fraction of A and B in the vapour phase is
1:3,then the mole fraction of A in the solution at the same
temperature is

Geetha · Accepted Answer

Total vapour pressure = 2 + 3 = 5Mole fraction of A = 14 and mole fraction of B = 34  (moles are in the ratio 1 : 3)pA = XA × PTot     = 14 × 5 = 1
25pB = XB × PTot    = 34 × 5 = 3
75Thus the mole fraction of APAPB α XA XA = 1
253 75 = 13

two liquids A and B have vapour pressure in the ratio 2:3 at a certain temperature .Assuming that A and B forms an ideal solution and ratio of mole fraction of A and B in the vapour phase is 1:3,then the mole fraction of A in the solution at the same temperature is