During volcanic eruptions, hydrogen sulfide gas is given off and oxidized by air according to the following chemical equation:
2 H2S(g) + 3 O2(g) → 2 SO2(g) + 2 H2O(g)
Calculate the change in enthalpy of the reaction using the following information:
3 S(s) + 2 H2O(g) → 2 H2S(g) + SO2(g) ΔH°f = 146.9 kJ/mol
S(s) + O2(g) → SO2(g) ΔH°f = -296.4 kJ/mol