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Exact relations among mixture direct correlation integrals in terms of concentration variables are presented. Different closure (approximation) expressions for cross-direct correlation integrals are suggested. These closures are joined with the exact relations among direct correlation integrals to derive equations for thermodynamic mixture proper­ties on the basis of the hard-sphere and Lennard-Jones models. Zwischen direkten Korrelationsintegralen von Komponenten in Mischungen werden auf Grund von Konzentrationsvariablen exakte Beziehungen vorgestellt. Fiir Kreuzkorrela­ tions-Integrale werden verschiedene Niiherungsausdriicke angegeben. Diese Niiherungen werden mit den exakten Beziehungen aus den direkten Korrelationsintegralen kombiniert, um Gleichungen fiir thermodynamische Eigenschaften der Mischungen auf Grund des Hart-Kugel-Modells und des Lennard-Jones-Modells abzuleiten.

Model Calculations of Thermodynamic Mixture Properties from Direct Correlation Integrals