EXPERIMENTAL-DETERMINATION OF THE ISOBARIC SPECIFIC-HEAT CAPACITIES OF MULTICOMPONENT VAPORS UP TO TEMPERATURES OF 600-K

A new flow calorimeter has been constructed for the determination of t he isobaric specific heat capacities of multicomponent vapors. It can yield reliable values over a wide temperature range with deviations of less than 1.0%. Using this apparatus, the isobaric specific heat capa cities of benzene-cyclohexane, benzene-carbon tetrachloride and ethano l-carbon tetrachloride vapor mixtures have been determined under atmos pheric pressure and up to 600 K. For polar mixtures, a slightly negati ve excess heat capacity was found, and this is explained.