Starting from the PY-like integral equation of RISM-1 type and using the Kirkwood-Buff theory, we evaluated the differences in the partial molar volumes of solute V : of cis and trans isomers. The system investigated consists of a tetratomic A-B-B-A fused hard sphere and a single hard sphere both of which are considered as solvent or solute. To compare the evaluated values with the actual values, the VTs were determined for cis-and trans-decahydronaphthalene dissolved in such solvents as carbon tetrachloride, hexane, and benzene, etc., as well as for hexane andpdioxane in cis-and trans-decahydronaphthalene.The evaluation and experimental results have agreed in the relation that V;(trans) > V: (ci s) and also in the magnitude of their differences. Clear correlation was observed between the isothermal compressibility of the solvent and the quantity V : -V, where Vis the molar volume of solute decahydronaphthalene.
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