Question

For which of the following reactions does AHF = AHyxmº? a. 6C(s) + 6H(g) → C6H6 (1) b. 2N2 (g) + O2(g) → NO2 (g) c. N2 (g) + 3 H2 (g) → 2NH3 (g) d. H2O (1) + 12 O2 (g) → N2O2(1) e. All of the above f. None of the above

Answer 1

The standard heat of formation $\Delta H^{_{f}^{o}}$ is equal to the standard heat of reaction, for those relations in which the number of moles of reactant and product participating are equal to each other.

Among the given reactions there is no such reactions which have same number of moles of reactant and product. Hence none of them will have same heat of formation and heat of reaction

There correct option is (f)