Low-temperature heat capacity and standard molar enthalpy of formation of potassium L-threonate hydrate K(C4H7O5)center dot H2O
文献类型：期刊论文
| 作者 | Wei, Q; Chen, SP; Gao, SL; Di, YY; Tan, ZC; Shi, QZ |
| 刊名 | chinese journal of chemistry
 |
| 出版日期 | 2006-02-01 |
| 卷号 | 24期号:2页码:187-192 |
| 关键词 | potassium L-threonate hydrate low-temperature heat capacity adiabatic calorimetry rotary-bomb combustion calorimetry standard molar enthalpy of formation |
| 英文摘要 | the solid potassium l-threonate hydrate, k(c4h7o5)(h2o)-h-., was synthesized by the reaction of l-threonic acid with aqueous potassium hydrogen carbonate and characterized by means of chemical and elemental analyses, ir and tg-dtg. low-temperature heat capacity of k(c4h7o5)(h2o)-h-. has been precisely measured with a small sample precise automated adiabatic calorimeter over the temperature range from 78 to 395 k. an obvious process of the dehydration occurred in the temperature region of 364-382 k. the peak temperature of the dehydration of the compound has been observed to be (380.524 +/- 0.093) k by means of the heat capacity measurements. the molar enthalpy, delta(d)h(m), and molar entropy, delta(d)s(m), of the dehydration of k(c4h7o5)(h2o)-h-. were calculated to be (19.655 +/- 0.012) kj/mol and (51.618 +/- 0.051) j/(k-mol) by the analysis of the heat-capacity curve. the experimental molar heat capacities of the solid from 78 to 362 k and from 382 to 395 k have been respectively fitted to two polynomial equations of heat capacities against the reduced temperatures by least square method. the constant-volume energy of combustion of the compound, delta(c)u(m), has been determined to be (-1749.71 +/- 0.91) kj(.)mol(-1) by an rbc-ii precision rotary-bomb combustion calorimeter at 298.15 k. the standard molar enthalpy of formation of the compound, delta(f)h(m)(theta) has been calculated to be (- 1292.56 +/- 1.06) kj(.)mol(-1) from the combination of the standard molar enthalpy of combustion of the compound with other auxiliary thermodynamic quantities. |
| WOS标题词 | science & technology ; physical sciences |
| 类目[WOS] | chemistry, multidisciplinary |
| 研究领域[WOS] | chemistry |
| 关键词[WOS] | thermodynamic properties ; acid ; calorimeter |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000235202400006 |
| 公开日期 | 2015-11-17 |
| 源URL | [http://159.226.238.44/handle/321008/140001]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 作者单位 | 1.NW Univ Xian, Dept Chem, Xian 710069, Peoples R China 2.Chinese Acad Sci, Dalian Inst Chem Phys, ThermoChem Lab, Dalian 116023, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wei, Q,Chen, SP,Gao, SL,et al. Low-temperature heat capacity and standard molar enthalpy of formation of potassium L-threonate hydrate K(C4H7O5)center dot H2O[J]. chinese journal of chemistry,2006,24(2):187-192. |
| APA | Wei, Q,Chen, SP,Gao, SL,Di, YY,Tan, ZC,&Shi, QZ.(2006).Low-temperature heat capacity and standard molar enthalpy of formation of potassium L-threonate hydrate K(C4H7O5)center dot H2O.chinese journal of chemistry,24(2),187-192. |
| MLA | Wei, Q,et al."Low-temperature heat capacity and standard molar enthalpy of formation of potassium L-threonate hydrate K(C4H7O5)center dot H2O".chinese journal of chemistry 24.2(2006):187-192. |
入库方式： OAI收割
来源：大连化学物理研究所
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