T (K) P sat (kPa)
Acetonitrile(1) 318.15 27.778
Benzene(2) 318.15 29.819
Experiment data Modified Raoult `s Law and experimental data
P (kPa) x1 y1 Ln(γ1) exp Ln(γ2) exp GE/RT GE/x1x2RT exp x1x2RT/GE
29.819 0.0000 0.0000 0.0000 0.0000
31.957 0.0455 0.1056 0.9821 0.0042 0.0487 1.1215 0.8917
33.553 0.0940 0.1818 0.8485 0.0160 0.0943 1.1073 0.9031
35.285 0.1829 0.2783 0.6590 0.0442 0.1566 1.0479 0.9543
36.457 0.2909 0.3607 0.4870 0.0974 0.2107 1.0214 0.9790
36.996 0.3980 0.4274 0.3578 0.1656 0.2421 1.0105 0.9896
37.068 0.5069 0.4885 0.2515 0.2542 0.2529 1.0117 0.9885
36.978 0.5458 0.5098 0.2178 0.2915 0.2513 1.0136 0.9866
36.778 0.5946 0.5375 0.1797 0.3415 0.2453 1.0176 0.9827
35.792 0.7206 0.6157 0.0962 0.5014 0.2094 1.0399 0.9616
34.372 0.8145 0.6913 0.0490 0.6514 0.1607 1.0639 0.9399
32.331 0.8972 0.7869 0.0206 0.8099 0.1017 1.1031 0.9066
30.038 0.9573 0.8916 0.0071 0.9389 0.0469 1.1476 0.8714
27.778 1.0000 1.0000 0.0000 0.0000

Part (a) Margules equation











"So," A12= 1.1278
A21= 1.1529
C= 0.526
Experiment data Margules equation
P exp x1 y1 Ln(γ1) Ln(γ2) GE/RT P calc GE/x1x2RT
29.819 0.0000 0.0000 1.1278 0.0000 0.0000 29.8190 1.1278
31.957 0.0455 0.1056 0.9890 0.0032 0.0480 31.9509 1.1061
33.553 0.0940 0.1818 0.8599 0.0128 0.0924 33.5341 1.0854
35.285 0.1829 0.2783 0.6659 0.0437 0.1575 35.3410 1.0538
36.457 0.2909 0.3607 0.4877 0.0986 0.2118 36.4947 1.0266
36.996 0.3980 0.4274 0.3548 0.1681 0.2424 37.0015 1.0118
37.068 0.5069 0.4885 0.2493 0.2552 0.2522 37.0458 1.0090
36.978 0.5458 0.5098 0.2168 0.2913 0.2507 36.9561 1.0111
36.778 0.5946 0.5375 0.1791 0.3413 0.2449 36.7636 1.0159
35.792 0.7206 0.6157 0.0957 0.5027 0.2094 35.7996 1.0400
34.372 0.8145 0.6913 0.0468 0.6652 0.1615 34.4664 1.0688
32.331 0.8972 0.7869 0.0158 0.8503 0.1016 32.4943 1.1018
30.038 0.9573 0.8916 0.0029 1.0161 0.0462 30.1874 1.1303
27.778 1.0000 1.0000 0.0000 1.1529 0.0000 27.7780 1.1529
Error= 0.0677 kPa




























Part (b) Consistency test
Experimental data Theoritical data Consistency data
x1 Ln(γ1/γ2) GE/RT Ln(γ1/γ2) GE/RT δ ln(γ1/γ2) δ GE/RT
0.0455 0.9779 0.0487 0.9858 0.0480 0.0079 -0.0007
0.0940 0.8324 0.0943 0.8471 0.0924 0.0146 -0.0019
0.1829 0.6148 0.1566 0.6222 0.1575 0.0074 0.0009
0.2909 0.3896 0.2107 0.3891 0.2118 -0.0005 0.0011
0.3980 0.1922 0.2421 0.1867 0.2424 -0.0055 0.0003
0.5069 -0.0027 0.2529 -0.0058 0.2522 -0.0031 -0.0007
0.5458 -0.0736 0.2513 -0.0745 0.2507 -0.0008 -0.0006
0.5946 -0.1618 0.2453 -0.1622 0.2449 -0.0003 -0.0004
0.7206 -0.4052 0.2094 -0.4071 0.2094 -0.0019 0.0000
0.8145 -0.6024 0.1607 -0.6185 0.1615 -0.0161 0.0007
0.8972 -0.7893 0.1017 -0.8344 0.1016 -0.0452 -0.0001
0.9573 -0.9318 0.0469 -1.0131 0.0462 -0.0813 -0.0007

























Part (c) Barker`s method