Excess heat capacities of the mixtures containing methylcyclohexane at 298.15 K

Excess isobaric heat capacities of the mixtures {x cyclohexane, or benzene, or toluene+(1−x) methylcyclohexane} and {x 2-butanone+(1−x) methylcyclohexane or cyclohexane} were measured at 298.15 K. The mixtures {x toluene+(1−x) cyclohexane} and {x cyclohexanone+(1−x) methylcyclohexane, or cyclohexane, or toluene, or benzene} already reported were referred to be compared with them. The excess heat capacities of the methyl substituted molecule systems shift to positive direction from that of the non-substituted molecule systems, for the corresponding solvents. This phenomenon seems to relate to an entropy contribution due to the less molecular symmetry of the methyl-substituted molecules.