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Abstract
Abstract The isobaric vapor heat capacities of five binary systems: ethanol-butanone, ethanol-benzene, ethanol-ethyl acetate, butanone-benzene and butanone-ethyl acetate and two ternary systems: ethanol-butanone-benzene and ethanol-butanone-ethyl acetate, with respect to compositions are determined at ca. 404.6 K and atmospheric pressure by using a constant-flow calorimeter. The accuracy of the calorimeter was checked by measuring the heat capacity of benzene and the benzene-carbon tetrachloride binary system for comparison with the literature data. The experiment error is less than 0.7%. The different changes of the vapor heat capacities with the compositions were discussed under the consideration of the different molecular interactions. Two well-known generalized equations of state were also selected for the estimation of the vapor heat capacities.
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