Ozone, O3 (g), is a form of elemental oxygen that is important in the absorption of ultraviolet radiation in the stratosphere. It decomposes to O2 (g) at room temperature and pressure according to the following reaction:
2O3 (g) --> 3 O2 (g) Delta H = -284kJ
What is the enthalpy change for this reaction per mole of O3(g)?