Use this information 1/2N2(g)+O2(g)NO2(g)H= +33.2kJ/mole 1/2N2(g)+1/2O2(g)NO(g)H=+90.3 kJ/mole N2(g)+2O2(g)N2O4(g)H=+9.2 kJ/mole to calculate the H for this reaction: 4NO(g)+2NO2(g)2N2O4(g)+N2(g) Be sure to include the sign of your H value