Densities, Speeds of Sound, Excess Molar Enthalpies, and Heat Capacities of o-Chlorotoluene and Cyclic Ether Mixtures

Abstract

The densities, ρ, speeds of sound, u, and excess heat capacities, CPE data of binary mixtures formed by o-chlorotoluene with 1,3-dioxolane or 1,4-dioxane or tetrahydropyran at (298.15, 303.15, and 308.15) K and excess molar enthalpies, HE, of the same mixtures at 308.15 K have been measured over the entire composition range at atmospheric pressure. The excess molar volumes, VE, and excess molar isentropic compressibilities, κSE, data have been calculated from experimental densities and speeds of sound data. The VE, κSE, and HE values for o-chlorotoluene (1) + 1,3-dioxolane or 1,4-dioxane (2) mixtures are positive, and those for o-chlorotoluene (1) + tetrahydropyran (2) mixture are negative over whole range of composition. However, CPE values for the studied mixtures are positive over the entire range of composition. The VE, κSE, HE, and CPE data have been estimated in terms of graph and Prigogine–Flory–Patterson (except CPE data) theories. The results indicate that VE, κSE, HE, and CPE values estimated via graph theory are in agreement with experimental values.