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

question 69

Multiple Choice

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

• A) -504 kJ
• B) -372 kJ
• C) -24 kJ
• D) 24 kJ
• E) 504 kJ

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