High-temperature combustion calorimetry 1. Enthalpies of formation of tungsten oxides

The enthalpies of formation of the tungsten oxides WO2, WO2.72, and WO2.90 have been determined by oxidation to WO3 in a high-temperature microcalorimeter. After correction, the standard enthalpies of formation at 298.15 K are −(140.19 ± 0.70), −(186.34 ± 0.27), and −(195.08 ± 0.22) kcalth mol−1, respectively.