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Lattice Models for Fluids - Regular Solution Model

1.
Problem Statement:

For the regular solution model, develop the equations for the compositions of the coexisting phases in a binary system and plot the phase boundary as a function of χ/RT.



2. This question stems from Sandler's Introduction to Applied Statistical Thermodynamics.
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3. The Attempt at a Solution

I am having trouble understanding how to approach this problem. I know that the equations I need to develop are a function of x1, x2 -> (1-x1). I do not know where to start when considering an equation for a phase boundary.

Any help would be appreciated.





 
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