26. The ozone layer reduces the amount of ultraviolet radiation that reaches * 1poi the surface of the Earth. In the upper atmosphere, ozone can be depleted by a two-step reaction, as represented by the equations below. The energy transferred during the reaction represented by the overall equation is Equation I Equation II EquationIEquationIIOverailEquationO3(g)+NO(g)NO2(g)+O(g)O3(g)+O(g)NO2(g)+O2(g)NO(g)+O2(g)2O2(g) 391.9kJ 142.7kJ 249.2kJ 9.7kJ