Enthalpies of formation of cerium dioxide, cerium sesquicarbide, and cerium dicarbide

The enthalpies of formation of cerium dioxide, cerium sesquicarbide, and cerium dicarbide have been determined by oxygen bomb calorimetry and found to be ΔH°f(CeO2, 298.15 K) = −(260.6 ± 0.2) kcal mol−1, ΔH°f(CeC1.5, 298.15 K) = −(21.1 ± 0.7) kcal mol−1, and ΔH°f(CeC2.0, 298.15 K) = −(23.1 ± 1.3) kcal mol−1.