Change in Thermodynamic Properties Resulting from the Formation of Ideal Solutions

1a Change in Thermodynamic Properties Resulting from the Formation of Ideal Solutions 

Equation (7.6) is the starting point for deriving equations for Amix2[j[, the change in Zm for forming an ideal mixture. For the ideal solution, 7r.( = 1 and equation (7.6) becomes 

The entropy change to form an ideal mixture from the pure components is obtained by differentiating equation (7.7) with respect to T. Since x, is independent of T, the result is 

The ideal enthalpy of mixing is easily obtained from equations (7.7) and (7.8) and the relationship 

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