What is the composition of the vapour which is in equilibrium at `30^(@)"C"` with benzene-toluene solution with a mole fraction of benzene of 0.40? With a mole fraction of benzene of 0.60?
`P_(b)^(@)=119"torr and " P_(t)^(@)=37 torr`

Answer

0.682,0.318;0.829,0.171

Explanation

`Y_(B)=(X_(B)P_(B)^(0))/(X_(t)P_(t)^(0)+X_(B)P_(B)^(0))`
(a) `Y_(B)=(0.40xx119)/(0.40xx119+0.60xx37)=0.682`
`Y_(t)=0.318`
(b) `X_(B)=0.6`
`Y_(B)=(0.6xx119)/(0.6xx119+0.60xx37)=0.829," Y"_(t)=1.000-0.829=0.171`