The standard molar enthalpies of formation and heat capacities of PbMoO4 (s) and Pb2MoO5 (s)

Highlights: • Standard molar enthalpies of formation of PbMoO₄ (s) and Pb₂MoO₅ (s) determined. • Heat capacities of PbMoO₄ (s) and Pb₂MoO₅ (s) were measured using DSC. • Cp data were compared with Neumann-Kopp rule. The standard enthalpies of formation of PbMoO₄ (s) and Pb₂MoO₅ (s), at 298.15 K were determined by solution calorimetry and are found to be (−1059.6 ± 2.2) kJ mol⁻¹ and (−1274.7 ± 2.3) kJ mol⁻¹, respectively. The heat capacities of PbMoO₄ (s) and Pb₂MoO₅(s) were measured using differential scanning calorimetry (DSC). The measured heat capacities as a function of temperature are expressed as:$C_p<{\text{PbMoO}}_4>\left({\text{J K}}^{-1}{\text{mol}}^{-1}\right)\pm 4.1=127.31+30.47\times {10}^{-3}\text{T}-1.79\times {10}^6{\text{T}}^{-2}(\text{T}:313–798\text{K})$ $C_p<{\text{Pb}}_2{\text{MoO}}_5>\left({\text{J K}}^{-1}{\text{mol}}^{-1}\right)\pm 6.2=169.20+66.69\times {10}^{-3}\text{T}-1.99\times {10}^6{\text{T}}^{-2}(\text{T}:308–798\text{K})$