Calculate the change of enthalpy for the reaction N2 + O2 --> 2NO from the following reactions: Reaction 1: 4NH3 + 3O2 --> 2N2 + 6H2O Change in enthalpy: -1530 kJ

Reaction 2: 4NH3 + 5O2 --> 4NO + 6H2O Change in enthalpy: -1170 kJ

Reaction 3: 2N2 + 6H2O --> 4NH3 + 3O2 Change in enthalpy: +1530 kJ
Include the following:
-The numerical answer with correct units.
-State which reactions, if any, you had to "Flip".
-State which reactions you had to multiply, if any, to get the correct amount of the compound. Also, include how much you multiplied the reaction by.