Consider the following reaction between hydrogen sulfide (H2S) gas and oxygen (O2) gas.
2 H2S(g) + 3 O2(g) → 2 H2O(g) + 2 SO2(g)
Using standard enthalpies of formation, calculate the standard enthalpy change for this reaction.
answer in kJ/mol
Is this reaction endothermic or exothermic?