Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid

doi:10.1088/1674-1056/19/6/060517

Abstract This paper reports that the low-temperature heat capacities of pyridine-2,6-dicarboxylic acid were measured by a precision automatic calorimeter over a temperature range from 78~K to 380~K. A polynomial equation of heat capacities as a function of temperature was fitted by the least-squares method. Based on the fitted polynomial, the smoothed heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15~K were calculated and tabulated at intervals of 5~K. The constant-volume energy of combustion of the compound was determined by means of a precision rotating-bomb combustion calorimeter. The standard molar enthalpy of combustion of the compound was derived from the constant-volume energy of combustion. The standard molar enthalpy of formation of the compound was calculated from a combination of the datum of the standard molar enthalpy of combustion of the compound with other auxiliary thermodynamic quantities through a Hess thermochemical cycle.

Keywords: pyridine-2 6-dicarboxylic acid adiabatic calorimetry low-temperature heat capacity standard molar enthalpy of formation

Received: 26 October 2009
Accepted manuscript online:

PACS:	65.40.G-	(Other thermodynamical quantities)
	82.60.Cx	(Enthalpies of combustion, reaction, and formation)

Fund: Project supported by the National Natural Science Foundations of China (Grant Nos.~20673050 and 20973089).

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Yang Wei-Wei(杨伟伟), Di You-Ying(邸友莹), Kong Yu-Xia(孔玉霞), and Tan Zhi-Cheng(谭志诚) Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid 2010 Chin. Phys. B 19 060517

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Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid

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