Excess molar enthalpies of cyclic ethers with cyclohexane, methylcyclohexane, or chlorocyclohexane

Excess molar enthalpies for mixtures of tetrahydrofuran, tetrahydropyran, 2 -methyltetrahydrofuran or 2,5-dimethyltetrahydrofuran with cyclohexane, met hylcyclohexane, or chlorocyclohexane were determined at 25 degreesC. The ex cess enthalpies are positive for the mixtures containing cyclohexane or met hylcyclohexane, but negative for the mixtures containing chlorocyclohexane. The results were used with the Prigogine-Flory-Patterson theory to predict the corresponding excess molar volumes.