Two substance A and B forming ideal solutions have PA o : PB o = 1 : 2 and mole fractions in liquid phase as XA : XB = 1 : 2, then mole fraction of A in vapour phase will be a) 0.33 b) 0.25 c) 0.52 d) 0.2 Answer is d please explain how Share with your friends Share 0 Yasodharan answered this Dear Student, The computation are expressed below, PAo=1, PBo=2XA=1, XB=2Ptotal =PA+PB=PAoXA+PBoXB= 1(1)+2(2) =5by Daltons law,YA=PAoPtotal=15=0.2Hence answer is Option (D) 0.2 Regards. 2 View Full Answer