We can use the following equation to solve for ΔH˚rxn:
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.
Calculate ΔH° for each of the following reactions, which occur in the atmosphere.
(a) O3(g) + NO(g) → NO2(g) + O2(g)
(b) SO3(g) + H2O(l) → H2SO4(aq)