The enthalpies of formation of nesquehonite, MgCO3 * 3H2O, and hydromagnesite, 5MgO * 4CO2 * 5H2O
Journal of Research of the U.S. Geological Survey
By: Bruce S. Hemingway and Richard A. Robie
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Abstract
The enthalpies of formation, ΔH°f, of nesquehonite, MgCO3 * 3H2O, and hydromagnesite, 5MgO * 4CO2 * 5H2O, have been determined by HCl solution calorimetry. For the reaction MgO(c) + CO2(g) + 3H2O(l) = MgCO2 * 3H2O(c), the enthalpy change at 298.15 K is -29,781*40 cal mor' . For the reaction 5MgO(c) + 4CO2 + 5H2O = 5MgO * 4CO2 * 5H2O, the enthalpy change at 298.15 K is -120,310±120 cal. For MgCO3 * 3H2O the standard molar enthalpy and standard Gibbs free energy of formation, ΔH°f,298 and ΔG°f,298 are -472,576+110 and 412,040±120 cal. ΔH°f,298 and ΔG°f,298 for 5MgO * 4CO2 * 5H2O are -1,557,090±250 and -1,401,71 0±250 cal.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The enthalpies of formation of nesquehonite, MgCO3 * 3H2O, and hydromagnesite, 5MgO * 4CO2 * 5H2O |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 1 |
| Issue | 5 |
| Year Published | 1973 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 5 p. |
| First page | 543 |
| Last page | 547 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |