The enthalpies of formation of nesquehonite, MgCO3 * 3H2O, and hydromagnesite, 5MgO * 4CO2 * 5H2O

Journal of Research of the U.S. Geological Survey
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Abstract

The enthalpies of formation, ΔH°f, of nesquehonite, MgCO3 * 3H2O, and hydromagnesite, 5MgO * 4CO* 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.

Additional publication details

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
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