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Chin. Phys. B, 2010, Vol. 19(6): 060517    DOI: 10.1088/1674-1056/19/6/060517
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Low-temperature heat capacities and standard molar enthalpy of formation of pyridine-2,6-dicarboxylic acid

Yang Wei-Wei(杨伟伟)a), Di You-Ying(邸友莹) a)† , Kong Yu-Xia(孔玉霞)a), and Tan Zhi-Cheng(谭志诚) b)
a College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China; b Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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).

Cite this article: 

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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