(a) `A` liquid mixture of benzene and toluene is composed of `1` mol of benzene and `1` mol of toluene. If the pressure over the mixture at `300K` is reduced, at what pressure does the first bubble form?
(b) What is the composition of the first bubble formed.
(c) If the pressure is reduced further, at what pressure does the last trace of liquid disapper?
(d) What is the composition of the last drop of liquid?
(e) What will be the pressure, composition of the liquid and the composition of vapour. when `1` mol of the mixture has been vaporized? Given `P_(T)^(0)=100mmHg`

Answer

(a) `70mmHg` (b) `Y_(A)=2//7,Y_(B)=5//7` (c) `P=400//7=57.14mm` (d) `X_(A)=(5)/(7),X_(B)=(2)/(7)` (e) `63.25 mm` (liquid composition `0.3875,06125`) (vapour composition `0.6125,0.3875`)