Problem: 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 onlyB. II and IV only C. III and IV onlyD. II, III and IV only E. None of them

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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

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Problem Details

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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