Example 05.05 Temperature Dependence of the Activity Coefficients

problem:

Estimate the activity coefficients for the system ethanol (1) - water (2) at theta = 50 °C using the experimental excess enthalpy data of Larkin assuming that the excess enthalpy is independent of temperature.

general

constants

and

definitions:

input data

Liquid and vapor mole fractions, temperature, pressure

Activity coefficients at theta = 70°C

Partial molar excess enthalpies:

Solution

Calculation of the activity coefficients at theta = °C