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

The densities, rho, speeds of sound, u, and excess heat capacities, C-P(E) 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, H-E, of the same mixtures at 308.15 K have been measured over the entire composition range at atmospheric pressure. The excess molar volumes, V-E, and excess molar isentropic compressibilities, kappa(E)(S), data have been calculated from experimental densities and speeds of sound data. The V-E, kappa(E)(S), and H-E 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, C-P(E) values for the studied mixtures are positive over the entire range of composition. The V-E, kappa(E)(S), H-E, and C-P(E), data have been estimated in terms of graph and Prigogine-Flory-Patterson (except C-P(E) data) theories. The results indicate that V-E, kappa(E)(S), H-E, and C-P(E), values estimated via graph theory are in agreement with experimental values.