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题名: Low-temperature heat capacities and standard molar enthalpy of formation of nicotinic acid
作者: Di You-Ying;  Shi Quan;  Tan Zhi-Cheng;  Sun Li-Xian
关键词: nicotinic acid ;  adiabatic calorimetry ;  low-temperature heat capacity ;  oxygen-bomb combustion calorimetry ;  standard molar enthalpy of formation
刊名: ACTA CHIMICA SINICA
发表日期: 2007-09-28
卷: 65, 期:18, 页:1940-1946
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Low-temperature heat capacities of nicotinic acid (C6H5NO2) were measured by a precision automated adiabatic calorimeter over the temperature range from 78 to 400 K. A polynomial equation of the heat capacities as a function of the temperature was fitted by the least square 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 at the interval of 5 K. The constant-volume energy of combustion of nicotinic acid at T=298.15 K was measured by a precision oxygen-bomb combustion calorimeter to be Delta U-c= -(24528.3 +/- 16.1) J center dot g(-1). The standard molar enthalpy of combustion for the compound was determined to be Delta H-c(m)circle minus = - (3019.05 +/- 1.98) kJ center dot mol(-1), according to the definition of the combustion heat. Finally, the standard molar enthalpy of formation for the compound was determined to be Delta(f) H-m(circle minus)= - (56.76 +/- 2.13) kJ center dot mol(-1), in accordance with Hess law.
语种: 英语
WOS记录号: WOS:000249931300003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140440
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Liaocheng Univ, Coll Chem & Chem Engn, Liaocheng 252059, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Di You-Ying,Shi Quan,Tan Zhi-Cheng,et al. Low-temperature heat capacities and standard molar enthalpy of formation of nicotinic acid[J]. ACTA CHIMICA SINICA,2007,65(18):1940-1946.
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