Use the Following Data to Calculate the Standard Heat (Enthalpy)

question 64

Multiple Choice

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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