Two liquids `A` and `B` form an idea solution. What will be the vapour pressure at `27^(@)C` of a solution having `1.5 mol` of `A` and `4.5 mol` of `B`? The vapour pressure of `A` and `B` at `27^(@)c` is `0.116 atm` and `0.140 atm`, respectively.

Explanation

`n_(A)=1.5 n_(B)=4.5`
`chi_(A)=1.5/(1.5 + 4.5)=1.5/6.0 =1/4`
`chi_(B)=1-(1/4)=(3/4)`
`P=P_(A)^(@)chi_(A) + P_(B)^(@)chi_(B)=0.116xx(1/4) + 0.14 xx(3/4)`
`P=0.029 + 0.105`
`=0.134`