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学科主题: 物理化学
题名: THERMODYNAMIC STUDY OF HYDTATED SODIUM L-THREONATE, Na (C4H7O5)×H2O(s)
作者: Di YY(邸友萤) ;  Tan ZC(谭志诚) ;  高胜利等
会议名称: 18th IUPAC Conference on Chemical Thermodynamics and The 12th National Conference on Chemical Thermodynamics and Thermal Analysis
会议日期: 2004-8-17
出版日期: 2004-08-17
会议地点: 中国
通讯作者: Zhi-Cheng Tan
部门归属: 十五室
主办者: 中国化学会
摘要: A novel compound, Na(C4H7O5)×H2O(s), was synthesized. The composition, structure and properties of the compound were determined by FTIR, TG/DTG, chemical and elementary analysis. Low-temperature heat capacities of the compound were measured with a precise automated adiabatic calorimeter in the temperature range of 78 ~ 390 K. One phase transition of solid-solid and a process of dehydration occurred in the temperature regions of 290~318 K and 367~373 K, respectively. The peak temperatures of the solid-solid transition and the dehydration of the compound were observed: Ttrans = (311.441  0.221) K and Td = (371.274  0.080) K, by the heat-capacity measurements. The molar enthalpy and entropy of the solid-solid transition of the substance were determined: (5.753  0.006) kJmol-1 and (18.473  0.016) JK-1mol-1. The molar enthalpy and entropy of dehydration of the substance were (15.353  0.027) kJmol-1 and (41.352  0.078) JK-1mol-1. The experimental values of molar heat capacities in solids (I, II and III) were respectively fitted to three polynomials by least square method. The constant volume energy of combustion of the compound were determined to be, - (1803.62  0.91) kJmol-1, by means of a RBC-II precision rotating-bomb combustion calorimeter at T = (298.15  0.001) K. The standard molar enthalpy of combustion of the compound was derived from its constant-volume energy of combustion to be, - (1802.38  0.91) kJmol-1. The standard molar enthalpy of formation of the compound has been calculated, [Na(C4H7O5)×H2O, s] = - (1265.84  1.06) kJmol-1, from the combination of the datum of standard molar enthalpy of combustion of the compound with other auxiliary thermodynamic quantities through a Hess thermochemical cycle.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/111784
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Di YY,Tan ZC,高胜利等. THERMODYNAMIC STUDY OF HYDTATED SODIUM L-THREONATE, Na (C4H7O5)×H2O(s)[C]. 见:18th IUPAC Conference on Chemical Thermodynamics and The 12th National Conference on Chemical Thermodynamics and Thermal Analysis. 中国. 2004-8-17.
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