Thermodynamic properties of the binary mixtures of cyclohexanone with globular species

Excess heat capacities CpE of the mixtures of cyclohexanone with toluene, chlorobenzene, methylcyclohexane and 1,4-dioxane and excess enthalpies HE of the mixtures with chlorobenzene and 1,4-dioxane were measured at 298.15 K. Density and speed of sound of the mixture of cyclohexanone with 1,4-dioxane were also measured at 298.15 K. Thermodynamic properties of the mixtures of cyclohexanone with globular solvents are discussed with reference to the heptane systems. HE of aliphatic systems is highly positive and their CpE show various steps of W-shaped curves. HE of 1,4-dioxane system is positive but a third of aliphatic ones and its CpE is negative. HE of aromatic systems is negative to form strong induced dipole–dipole interaction between aromatic and cyclohexanone molecules. CpE of these systems changes from negative to positive with the increase of the mole fraction of aromatics. However that of chlorobenzene is large and has no negative part.