Abstract
The coordination cluster theory, which has been shown to provide a good representation of the thermo-dynamic properties of a dilute solute in a binary solvent, is extended for multicomponent solvents. The extended theory permits one to predict activity coefficients of solutes in multicomponent sol-vents, based on values in the subsidiary binary systems. The theory takes into consideration three types of interactions, namely, those (i) between solute and solvent atoms, (ii) between solvent atoms that are near neighbors of the solute, and (iii) between solvent atoms not in the vicinity of the solute and all other solvent atoms. Calculations of the activity coefficients of oxygen dissolved in the Ag-Cu-Sn ternary solvent are in good agreement with measurements.
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