2002•Journal of Chemical & Engineering DataRequires access

Additivity of Thermodynamic Properties of Organic Compounds in the Crystalline State. 3. Heat Capacities and Related Properties of Urea Phenyl Derivatives

Vladimir Diky, Alexander A. Kozyro, Gennady J. Kabo

Abstract

Heat capacities of 1,1-diphenylurea, 1,3-diphenylurea, and 1,1-dimethyl-3-phenylurea in the range (5 to 300) K were measured with an adiabatic calorimeter. Related thermodynamic functions were obtained. These functions were proved to conform to additivity principles. Taking into account the parameters developed earlier for alkylureas, the additive parameters of the phenyl group for calculation of the heat capacity, entropy, and thermal enthalpy of organic compounds in the crystalline state were derived.

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Key concepts: Heat capacity, Additive function, Thermodynamics, Adiabatic process, Enthalpy, Calorimeter (particle physics), Chemistry, Specific heat