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K2O·MgO·6B2O3·10H2O的热化学研究(英文)
Thermochemistry of Dipotassium Magnesium Dodecaborate Decahydrate
【摘要】 在大约1mol·dm-3的盐酸水溶液中测定了K2O·MgO·6B2O3·10H2O的溶解焓。结合已获得的其它热化学数据,得出K2O·MgO·6B2O3·10H2O的标准摩尔生成焓为-(12250.35±9.68)kJ·mol-1,并利用“基团贡献法”计算出标准摩尔吉布斯自由能为-11103kJ·mol-1。从而计算出其标准摩尔生成熵和标准摩尔熵。
【Abstract】 The enthalpies of solution of K2O·MgO·6B2O3·10H2O in approximately 1mol·dm-3 aqueous hydrochloric acid,and of KCI in aqueous(hydrochloric acid +boric acid +magnesium oxide )were determined. Together with the previously determined enthal- pies of solution of H3BO3 in approximately 1 mol· dm-3HCI(aq), and of MgO in aqueous (hydrochloric acid+boric acid ),the standard molar enthalpy of formation of-(12250. 35± 9. 68)kJ· mol-1 for K2O· MgO· 6B2O3· 10H2O was obtained from the standard molar en- thalpies of formation of MgO(s), H2BO3(s), KCI(s), and H2O(1). The standard molar en- tropy of formation of-3848. 23J. K-1· mol-1 and standard molar entropy of 765. 96 J· K-1· mol-1 for K2O· MgO· 6B2O3· 10H2O were calculated from the thermodynamic relations.
- 【文献出处】 盐湖研究 ,Journal of Salt Lake Research , 编辑部邮箱 ,2001年04期
- 【分类号】O642.3
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