4 NH3 (g) + O2 (g) ➝ 2 N2H4 (g) + 2 H2O (l)     ΔHº = –196.42 kJ • Calculate the overall change in enthalpy when 10.00 grams of NH3 (g) reacts with excess O2 (g).    [Be sure to include the correct sign.] Enthalpy change: ___ kJ

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