You have the equations: 2H2O (l) →2H2 (g) + O2 (g), △H=572 kJ 2N2 (g) + 3H2 (g) →2NH3 (g), △H=-138 kJ 2NO2 (g) + 7H2 (g) →2NH3 (g) + 4H2O (l), △H=-1.18*103 kJ 2NO2 (g) →2N2 (g) + 2O2 (g), △H=□ What is the missing △H? -1.38*103 kJ +99.0 kJ +1.
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