Enthalpies of combustion, heat capacities, and enthalpies of vaporization of 1-ethylimidazole and 1-ethylpyrazole

The standard (p°=0.1 MPa) molar enthalpies of formation for liquid 1-ethylimidazole and 1-ethylpyrazole were derived from the standard molar enthalpies of combustion ΔcHm°, in oxygen, atT=298.15 K, measured by static bomb combustion calorimetry. The molar heat capacities of both liquids were measured in the temperature range (280 to 365 ) K by differential scanning calorimetry. The standard molar enthalpies of vaporization ΔglHm°, at the temperatureT=298.15 K were measured by Calvet microcalorimetry. The derived standard molar enthalpies of formation in the gaseous state are compared.Thanks are due to Junta National de Investiga¸c˜ ´ ao Cientıfica e Tecnologic ´ a Ž . JNICT , Lisbon, Portugal, and Consejo Superior de Investigaciones Cientıfica ´ s Ž . CSIC , Madrid, Spain for a joint research project CSICrJNICT. Financial support from DGICYT, Spain Ž . PB 96-0972 C02 01 is ackwnowledged