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For which of the following reaction(s) is the enthalpy change for the reaction not equal to ΔH°f of the product? I. 2H(g) → H2(g) II. H2(g) + O2(g) → H2O2(l) III. H2O(l) + O(g) → H2O2(l) A. II B. III C. I D. II and III E. I and III