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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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