Hydrogen sulfide gas is a poisonous gas with the odor of rotten eggs. It occurs in natural gas and is produced during the decay of organic matter, which contains sulfur. The gas burns in oxygen as follows:
2H2S(g) + 3O2(g) → 2H2O(l) + 2SO2(g)
Calculate the standard enthalpy change for this reaction using standard enthalpies of formation.