Title of article
Thermochemistry of magnesium oxysulfate
Author/Authors
Yue Tao، نويسنده , , Zhu Lixia، نويسنده , , Liu Zhihong، نويسنده , , Gao Shiyang، نويسنده , , Xia Shuping، نويسنده ,
Issue Information
دوهفته نامه با شماره پیاپی سال 2003
Pages
4
From page
237
To page
240
Abstract
The enthalpies of solution of magnesium oxysulfate compounds MgSO4·5MgO·7H2O and MgSO4·5MgO·8H2O in approximately 1 mol dm−3 aqueous hydrochloric acid were determined. From these results and the enthalpies of solution of MgSO4·7H2O and MgO in HCl(aq) respectively, the standard molar enthalpies of formation of −(6496.00±0.73) kJ mol−1 for MgSO4·5MgO·7H2O and −(6800.17±0.55) kJ mol−1 for MgSO4·5MgO·8H2O were obtained by using the standard molar enthalpies of formation of MgO(s), MgSO4·7H2O(s) and H2O(l). The standard molar entropies of formation of MgSO4·5MgO·7H2O and MgSO4·5MgO·8H2O were calculated from the thermodynamic relation with the standard molar Gibbs free energy of formation of MgSO4·5MgO·7H2O and MgSO4·5MgO·8H2O computed from a group contribution methods.
Keywords
Magnesium oxysulfate , Standard molar enthalpy of formation , Solution calorimetry , Aqueous hydrochloric acid solution , Molar enthalpy
Journal title
Thermochimica Acta
Serial Year
2003
Journal title
Thermochimica Acta
Record number
1196048
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