Using Hess's Law,what Is the Standard Enthalpy of Formation,ΔH°_f of Manganese(II)oxide,MnO(s)

question 39

Multiple Choice

Using Hess's law,what is the standard enthalpy of formation,ΔH°_f of manganese(II) oxide,MnO(s) ? 2MnO₂(s) → 2MnO(s) +O₂(g) ΔH°_rxn = +272.0 kJ/mol
MnO₂(s) + Mn(s) → 2MnO(s) ΔH°_rxn = -248.9 kJ/mol

• A)-520.9 kJ/mol
• B)-396.5 kJ/mol
• C)-384.9 kJ/mol
• D)-147.6 kJ/mol
• E)24 kJ/mol

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