CHEN 354- HW 5—Due Friday, February 26, 2010
Problem 1. For the system ethylene(1)/propylene(2) as a gas, estimate fˆ1 , fˆ2 , ˆ1 , ˆ2 at T=150oC and P=30
bar and y1 = 0.35:
(a) Through application of equation (11.63)
(b) Assuming that the mixture is an ideal solution
Problem 2. The data in Table 11.3 are experimental values of HE for binary liquid mixtures of 1,2
dichloroethane(1) and dimethyl carbonate (2) at 313.15 K and 1 atm.
(a) Determine from the data numerical values of the parameters a, b, and c in the correlating equation:
H E  x1 x2 a  bx1  cx12 
(b) Determine from the results of part (a) the maximum value of HE. At what value of x1 does this occur?
(c) Determine from the results of part (a) expressions for H1E and H 2E . Prepare a plot of these quantities
vs. x1 and discuss its features.
Problem 3. For an equimolar vapor mixture of propane (1) and n-pentane (2) at 75oC and 2 bar, estimate
Z, HR and SR. Second virial coefficients, in cm3/mol are:
T,oC
50
75
100
B11
-331
-276
-235
B22
-980
-809
-684
B12
-558
-466
-399
Equations (3.38), (6.55), (6.56), and (11.62) are useful.
Problem 4. Laboratory A reports the following results for equimolar values of GE for liquid mixtures of
benzene(1) with 1-hexanol(2):
GE = 805 J/mol at T=298 K; GE = 785 J/mol at T =323 K
Laboratory B reports the following result for the equimolar value of HE for the same system:
HE = 1060 J/mol at T = 313 K
Are the results from the two laboratories thermodynamically consistent with one another? Explain.
Problem 5. Calculate and f by the Redlich-Kwong equation of state for acetylene at 325 K and 15 bar
and compare with the results from a generalized correlation.