Use the following data to calculate the standard heat (enthalpy) of formation, ΔH °f, of manganese(IV) oxide, MnO2 (s).
2MnO2 (s) → 2MnO (s) + O2 (g) ΔH = 264 kJ
MnO2 (s) + Mn(s) → 2MnO (s) ΔH = -240 kJ
(a) -504 kJ
(b) -372 kJ
(c) 24 kJ
(d) -24 kJ
(e) 504 kJ
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