Part A. For which of the following reactions is ΔH°rxn equal to ΔH°f of the product(s)?
You do not need to look up any values to answer this question.
Check all that apply.
The standard heat of formation, ΔH∘f , is defined as the enthalpy change for the formation of one mole of substance from its constituent elements in their standard states. Thus, elements in their standard states have ΔH°f = 0. Heat of formation values can be used to calculate the enthalpy change of any reaction.
Consider, for example, the reaction
2 NO(g) + O2(g) ⇌ 2 NO2(g)
with heat of formation values given by the following table:
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