Determine the reaction where the reactants have 0 ΔH of formation in order to have a ∆H°rxn equal to ∆H°f for the product
Recall that ΔH˚rxn can be calculated from the enthalpy of formation (ΔH˚f) of the reactants and products involved:
For which of the following reactions is the value of ∆H°rxn equal to ∆H°f for the product?
I. N2(g) + O3(g) ⟶ N2O3(g)
II. 2 Ca(s) + O2(g) ⟶ 2 CaO(s)
III. 2 C(s, graphite) + 2 H2(g) ⟶ C2H4(g)
IV. 3 Mg(s) + N2(g) ⟶ Mg3N2(s)
A. I and III only
B. II and IV only
C. III and IV only
D. II, III and IV only
E. None of them
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