Thermodynamic investigation of ZnMoO4 (s) and Zn3Mo2O9 (s) compounds

Present study investigates the calorimetric and thermodynamic properties of ternary zinc molybdates, namely, ZnMoO4 (s) and Zn3Mo2O9 (s). A high temperature calorimeter is employed for measuring the enthalpy incre-ment and enthalpy of dissolution of Zn-Mo-O compounds. The variation of molar heat capacities of ZnMoO4 (s) and Zn3Mo2O9 (s) (deduced from the enthalpy increment data) with temperature can be expressed as follows: The standard molar enthalpies of formation of ZnMoO4 (s) and Zn3Mo2O9 (s) are determined employing 3Na2O.4MoO3 as the calorimetric solvent and the corresponding values are found to be-1137.51 +/- 1.7 and-2616.47 +/- 4.5 kJ mol-1 , respectively for ZnMoO4 (s) and Zn3Mo2O9 (s). These new experimental results coupled with the literature data are employed for generating thermodynamic functions of these compounds.

Automated summary

The study investigates the calorimetric and thermodynamic properties of ternary zinc molybdates, ZnMoO4 (s) and Zn3Mo2O9 (s). A high temperature calorimeter is used to measure their enthalpy increment and enthalpy of dissolution. The variation of molar heat capacities with temperature is determined, and the standard molar enthalpies of formation for ZnMoO4 (s) and Zn3Mo2O9 (s) are calculated. These results are then used to generate the thermodynamic functions of these compounds, along with available literature data.