Listed below are the constants in three activity-coefficientequations: Wilson's, Margules' and van Laar's, for the systemethanol-water. In addition, the vapor-liquid equilibria at onepressure are tabulated.
a) Using the Wilson equation and the constants listed below,find the bubble pressure and vapor composition for a mixture of 30mol% ethanol at 90 C
b) Using the Wilson equation, find the dew pressure andcomposition for a mixture of 80 mol% ethanol at 110 C
c) Using the Wilson equation, find the bubble temperature andcomposition for a mixture of 20% ethanol at 3.0 bar
d) Using the Wilson equation, find the dew temperature andcomposition for a mixture of 40% ethanol at 3.0 bar
Data:
| Pc, bar | Tc, K | ω | Vc | Zc |
| Ethanol (1) | 63.0 | 516.2 | 0.635 | 167. | 0.248 |
| Water (2) | 217.6 | 647.3 | 0.344 | 56.0 | 0.229 |
Antoine Constants
| A | B | C | Range (degrees C) |
| Ethanol (1) | 7.58667 | 1281.590 | 193.768 | 78-203 |
| Water (2) | 8.01767 | 1715.700 | 234.268 | 100-265 |
| Constants | A12 | A21 |
| Margules' | 1.1542 | 0.7485 |
| Van Laar | 1.4729 | 0.6772 |
| Wilson | 437.7515 | 847.0778
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