Abstract
Densities and heat capacities of ternary systems were determined at 25°C. The ternary systems consisted of: a polar molecule (component 1) + a mixture of alkanes (components 2 and 3) of different sizes and shapes. Five such systems were studied: chlorobenzene + cyclohexane + n-heptane; chlrobenzene + cyclohexane + n-hexadecane; chlorobenze + cyclohexane + isooctane; chlorobenzene + isooctane + n-heptane; 1-chloronaphthalene + isooctane + n-heptane. The excess molar volumes and heat capacities were obtained along dilution lines by component 1 (chlorobenzene or 1-chloronaphthalene) of mixtures of components 2 and 3 (at fixed component 2 mole fraction X2). Unexpectedly the excess heat capacities C Ep1(23) of the pseudo-binaries {1+(2+3)} do not always fall between the two (limiting) curves of C Ep12 and C Ep13 corresponding to the two binaries {1+2} and {1+3}. Instead, especially for {chlorobenzene + cyclohexane + an n-alkane} the C Ep1(23) curves are displaced toward less negative values, even beyond the limiting values corresponding to the binaries. This correlates semi-quantitatively with the negative C Ep23 of the binary {2+3}.
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Bendiab, H., Roux-Desgranges, G., Roux, A.H. et al. Excess heat capacities of ternary systems containing chlorobenzene or chloronaphthalene. J Solution Chem 23, 307–323 (1994). https://doi.org/10.1007/BF00973552
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DOI: https://doi.org/10.1007/BF00973552