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Use the following data to calculate the standard heat (enthalpy) of formation, H°f , of manganese(IV) oxide, MnO2 (s) .
2MnO2(s) 2MnO(s) + O2(g) H = 264 kJ
MnO2(s) + Mn(s) 2MnO(s) H = -240 kJ
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