Question

The binary system, acetone(1)-acetonitrile(2) conforms closely to Raoult’s Law.

a) Using the vapor-pressure data, prepare a graph showing P vs. x1 and P vs. y1 at 50ºC, and a graph showing T vs. x1 and T vs. y1 at 400 mm Hg. Thus when T is fixed, x1 and y1 vary with P, and when P is fixed, x1 and y1 vary with T.

b) The mixture which has an acetone mole fraction of 0.405 is heated slowly (so as to be at equilibrium) from a temperature of 45 ºC to a temperature of 60 ºC at constant pressure of 400 mmHg in a piston-and-cylinder apparatus. Show on a Txy diagram the physical states of the system during the process.

T(Celcius)	P1(mm Hg)	P2(mmHg)
38.45	400	159.4
42	458.3	184.6
46	532	216.8
50	615	253.5
54	707.9	295.2
58	811.8	342.3
62.33	937.4	400

Answer 1

Txy data