HW #4, P11.36 - Excess Gibbs Free Energy of a Real Liquid Mixture - 12 pts

The data in the table below 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 parameters a, b and c in the correlating equation:




b.) Determine from the results of part (a) the minimum value of HE. At what value of x1 does this occur ?

c.) Determine from the results of part (a) expressions for : partial molar HE1 and partial molar HE1. Prepare a plot of these quantities vs. x1 and discuss its features.

x1 HE~ (J/mol)
0.0426 -23.3
0.0817 -45.7
0.1177 -66.5
0.1510 -86.6
0.2107 -118.2
0.2624 -144.6
0.3472 -176.6
0.4158 -195.7
0.5163 -204.2
0.6156 -191.7
0.6810 -174.1
0.7621 -141.0
0.8181 -116.8
0.8650 -85.6
0.9276 -43.5
0.9624 -22.6