Abstract

Values for the heats of mixing were obtained calorimetrically for the systems C2H5OH-C6H12, CH3OH-C6H6 and C2H5OH-C6H6 at 25° over the complete range of composition. Analytical equations which summarize these values are: Benzene (1) - Methanol (2) System ΔHxM = x1x2[628.4 + 365.7(x1-x2) + 521.9(x1-x2)3 + 819.8(x1-x2)4 ] Benzene (1) - Ethanol (2) System ΔHxM = x1x2[748.8 + 534.1(x1-x2) + 265.7(x1-x2)2 + 408.7(x1-x2)3 + 434.1(x1-x2)4 ] Cyclohexane (1) - Ethanol (2) System ΔHxM = x1x2[615.0 + 132.4(x1-x2) + 195.9(x1-x2)2 + 251.5(x1-x2)3 + 521.7(x1-x2)4 ] where xi is the mole fraction of component i. The experimental data were satisfactorily interpreted by a generalized quasi-lattice theory in which each molecule was assigned a definite number of sites in the lattice and three different types of contact points were assigned to the alcohol molecules. The theory predicted interaction energies that were reasonable and consistent for all three systems, indicating that the quasi-lattice theory can be applied to systems in which association of molecules occurs.

Degree

College and Department

Physical and Mathematical Sciences; Chemistry and Biochemistry

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