Consider the following thermochemical equation:

2 Na2O2(s) + 2 H2O(l) 4 NaOH(s) + O2(g) ΔH° = -126 kJ

Calculate the enthalpy change (kJ) when 45.0 g of Na2O2 reacts with excess water?
Report your answer with the correct number of significant figures. Do not include units in your answer.