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题名: Low-Temperature Heat Capacities and Standard Molar Enthalpy of Formation of Potassium Benzoate C(7)H(5)O(2)K(s)
作者: Yang, Wei-Wei1;  Di, You-Ying1;  Yin, Zhen-Fen1;  Kong, Yu-Xia1;  Tan, Zhi-Cheng2
关键词: Adiabatic calorimetry ;  Heat capacity ;  Isoperibol solution-reaction calorimeter ;  Potassium benzoate ;  Standard molar enthalpy of formation ;  Thermodynamic function
刊名: INTERNATIONAL JOURNAL OF THERMOPHYSICS
发表日期: 2009-04-01
DOI: 10.1007/s10765-009-0568-4
卷: 30, 期:2, 页:542-554
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Thermodynamics ;  Chemistry, Physical ;  Mechanics ;  Physics, Applied
研究领域[WOS]: Thermodynamics ;  Chemistry ;  Mechanics ;  Physics
英文摘要: Potassium benzoate C(7)H(5)O(2)K (CAS Registry No. 582-25-2) was synthesized by the method of liquid phase reaction. Chemical and elemental analyses, FTIR, and X-ray powder diffraction (XRD) techniques were applied to characterize the composition and structure of the compound. Low-temperature heat capacities of the compound were measured by a precision automated adiabatic calorimeter over the temperature range from 78 K to 398 K. A polynomial equation of the heat capacities as a function of temperature was fitted by the least-squares method. Smoothed heat capacities and thermodynamic functions of the compound were calculated based on the fitted polynomial. In accordance with Hess's law, a reasonable thermochemical cycle was designed, and 100 mL of 1 mol center dot dm(-3) NaOH solution was chosen as the calorimetric solvent. The standard molar enthalpies of dissolution for the reactants and products of the supposed reaction in the selected solvent were measured by an isoperibol solution-reaction calorimeter. Finally, the standard molar enthalpy of formation of the title compound C(7)H(5)O(2)K (s) was derived to be -(610.94 +/- 0.77) kJ center dot mol(-1).
关键词[WOS]: CALORIMETER
语种: 英语
WOS记录号: WOS:000264843000013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141365
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, Shandong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Yang, Wei-Wei,Di, You-Ying,Yin, Zhen-Fen,et al. Low-Temperature Heat Capacities and Standard Molar Enthalpy of Formation of Potassium Benzoate C(7)H(5)O(2)K(s)[J]. INTERNATIONAL JOURNAL OF THERMOPHYSICS,2009,30(2):542-554.
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