3. Calcule o AH da reação a seguir:
MnO2 (s) + C(s) --> Mn(s) + CO2(g)

A partir das reações abaixo:
C(s) + O2(g) → CO2(g) Mn(s) + O2(g) → MnO2 (s) AH = -390 kJ AH = -520 kJ

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