Problem: Calculate ΔH° for each of the following reactions, which occur in the atmosphere.(a) C2H4(g) + O3(g) → CH3CHO(g) + O2(g)(b) O3(g) + O(g) → 2 O2(g)

FREE Expert Solution

We can use the following equation to solve for ΔH˚rxn:


ΔH°rxn=ΔH°f, prod-ΔH°f, react


Use ΔH˚f from textbook/online


Note that we need to multiply each ΔH˚f by the stoichiometric coefficient since ΔH˚f is in kJ/mol. Also, note that ΔH˚f for elements in their standard state is 0.

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Problem Details

Calculate ΔH° for each of the following reactions, which occur in the atmosphere.

(a) C2H4(g) + O3(g) → CH3CHO(g) + O2(g)

(b) O3(g) + O(g) → 2 O2(g)