Thermochemistry of magnesium oxysulfate

被引：0
|
作者：
Yue, T
Zhu, LX
Liu, ZH
Gao, SY [1 ]
Xia, SP
机构：
[1] Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China
[2] Chinese Acad Sci, Inst Salt Lakes, Xian Branch, Xian 710043, Shaanxi Prov, Peoples R China
[3] Shaanxi Normal Univ, Inst Appl Chem, Xian 710062, Peoples R China
来源：
THERMOCHIMICA ACTA | 2003年 / 402卷 / 1-2期
关键词：
magnesium oxysulfate; standard molar enthalpy of formation; solution calorimetry; molar enthalpy; aqueous hydrochloric acid solution;
D O I：
暂无
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The enthalpies of solution of magnesium oxysulfate compounds MgSO4-5MgO-7H(2)O and MgSO4-5MgO-8H(2)O in approximately 1 mol dm(-3) aqueous hydrochloric acid were determined. From these results and the enthalpies of solution of MgSO4.7H(2)O and MgO in HCl(aq) respectively, the standard molar enthalpies of formation of -(6496.00 +/- 0.73) kJ mol(-1) for MgSO4-5MgO-7H(2)O and -(6800.17 +/- 0.55) kJ mol(-1) for MgSO4 . 5MgO-8H(2)O were obtained by using the standard molarenthalpies of formation of MgO(S), MgSO4 . 7H(2)O(s) and H2O(l). The standard molar entropies of formation of MgSO4- 5MgO . 7H(2)O and MgSO4 . 5MgO . 8H(2)O were calculated from the thermodynamic relation with the standard molar Gibbs free energy of formation Of MgSO4-5MgO-7H(2)O and MgSO4-5MgO-8H(2)O computed from a group contribution methods. (C) 2002 Elsevier Science B.V All rights reserved.
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页码：237 / 240
页数：4
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