Abstract
The molar enthalpies of solution of HfMo 2O 8, Mo and HfF 4 in (10 mol HF(aq) + 4.41 mol H 2O 2(aq)) dm −3 have been measured using an isoperibol type calorimeter. From these results and other auxiliary data, the standard molar enthalpy of formation of HfMo 2O 8(S) has been calculated to be Δ fH m(298.15K) = −2605.8 ± 5.9kJ mol −1. This value of enthalphy of formation of HfMo 2O 8 is consistent with the second law enthalpy of formation of HfMo 2O 8 determined in this laboratory by transpiration technique.
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