Problem: In the standard enthalpy of formation, ΔH°f , for nitrogen(IV) oxide, NO2, is the enthalpy change for which reaction?  (A) N(g) + 2O(g) → NO2(g) (B) 1/2N2(g) + O2(g) → NO2(g) (C) 1/2N2O4(g) → NO2(g) (D) NO(g) + 1/2O2(g) → NO2(g)

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In the standard enthalpy of formation, ΔH°, for nitrogen(IV) oxide, NO2, is the enthalpy change for which reaction? 

(A) N(g) + 2O(g) → NO2(g)

(B) 1/2N2(g) + O2(g) → NO2(g)

(C) 1/2N2O4(g) → NO2(g)

(D) NO(g) + 1/2O2(g) → NO2(g)

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