What Have We Left Out

We ha c developed a model for the thermodynamic properties of ideal and regular solutions. Two components A and B will tend to mix because of the favorable entropy resulting from the many different ways of interspersing A and B particles. The degree of mixing also depends on w hether the. 46 attractions are stronger or weaker than the AA and BB attractions. In the next chapters we will apply this model to the properties of solutions. 

Ternary lattice mixtures. Consider a lattice model liquid mixture of three species of spherical particles, A, S, and C. As with binary mixtures, assume that all N = n.4 + Mb + Me sites are filled. 

Enthalpy of mixing. For a mixture of benzene and m-heptane having equal mole fractions, x = 1/2, and temperature T = 300 K, the enthalpy of mixing is AHmis = 220calmor . Compute xab- 

Limit of x In x terms that contribute to mixing entropies and free energies. What is the value of xlnx as X - 0  

Hydrophobic entropy. The entrop of dissolving benzene in water at high dilution is approximately-14calmor K at T = 15 C. 

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