Question

9. [20 points) When combined at 300K Acetone (A) and Benzene (B) behave as an ideal solution (e.g., the mixture obeys Raoult's Law). Given PA* = 250 Torr and P8* = 100 Torr, answer the following questions: (a) Pressure is reduced on the liquid mixture until the first vapor appears. If the vapor contains 75% Benzene, what is the total pressure at this point and what is the composition of the liquid phase (e.g., XA and XB)? (b) The pressure is then further reduced until all of the liquid has evaporated. What is the total pressure and the composition of the last trace of liquid (XA and XB) at this point?

Thermodynamics help!

Answer 1

09. given :- (Acetone) = 250torr. Benzene) = 100 tory a vap. mole fraction of benzene = 0.75 (B) - acetone = 0.25 (YA) - So, PA=XAPA = YAPT e PB = BP = IBPT 30 YAPT HB PB YB PT PAX 250 = 0.25 hay 1000:14 so = 2/17 - P = NAPA + Hope - = (3x250) +(45 X 100) = 117.64 torr when all liquid evaporated then Yo (vap. composition is flightrabant YA = 2 4 6 So, PA - PAPĂ - YAPT PB (RA) b IBP HA (250) = (2017) (1-2) (100) (15/17 Xo = 1-8A = 2 Now, P = XA PA + Deepe 7 (250) + 25 (100) = 107.59 toss