Given the standard enthalpy changes for the following two reactions: N2(g) + 2 O2(g) long rightarrow 2 NO2(g) Delta H degree = 66.4 kJ 2 N2O(g) long rightarrow 2 N2(g) + O2(g) Delta H degree = -164.2 kJ what is the standard enthalpy change for the reaction: 2 N2O(g) + 3 O2(g) long rightarrow 4 NO2(g) Delta H degree = ? kJ