Low-temperature heat capacities and standard molar enthalpy of formation of aspirin
Data(s) |
2004
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Resumo |
Molar heat capacities (C-p,C-m) of aspirin were precisely measured with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 383 K. No phase transition was observed in this temperature region. The polynomial function of Cp, vs. T was established in the light of the low-temperature heat capacity measurements and least square fitting method. The corresponding function is as follows: for 78 Kless than or equal toTless than or equal to383 K, C-p,C-m/J mol(-1) K-1=19.086X(4)+15.951X(3)-5.2548X(2)+90.192X+176.65, [X=(T-230.50/152.5)]. The thermodynamic functions on the base of the reference temperature of 298.15 K, {DeltaH(T)-DeltaH(298.15)} and {S-T-S-298.15}, were derived. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
徐芬;孙立贤;谭志诚;Liang JG;邸友莹;田崎峰;张涛.Low-temperature heat capacities and standard molar enthalpy of formation of aspirin,JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,2004,76(2):481-489 |
Palavras-Chave | #adiabatic calorimetry #aspirin #combustion calorimetry #enthalpy of formation #heat capacity |
Tipo |
期刊论文 |