Enthalpy of formation of diyttrium trioxide

The standard molar change of energy at 298.15 K for the reaction 2Y(cr) + 1.502(g) = Y2O3(cr) was determined by combustion of yttrium metal in a calorimetric bomb with a microfurnace for heating the sample. The standard molar enthalpy of formation of Y2O3(cr) at 298.15 K was calculated to be -(1919.4±2.8)kJ·mol-1 (here and elsewhere in the paper the uncertainties are given for a 95 per cent confidence interval). (author)