Add time:07/23/2019         Source:sciencedirect.com

The equilibrium water vapor pressures, PH2O for the thermal dehydrations of some formate dihydrates, M(HCO2)2·2H2O, where M is Mg, Mn, Co, Ni and Zn, were measured by means of the transpiration method using a laboratory-made apparatus. These hydrates have a monoclinic isomorphous crystal structure with a space group, P21C. The thermodynamic data such as ΔG, ΔH and ΔS for the dehydration were derived from the PH2O and correlated to the crystal structures of these hydrates.Although the values of ΔH were expected to increase in the order of the hydrates of Mn

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