The decomposition of nitramide, O 2 NNH 2 , in water has the given chemical equation and rate law. O 2 NNH 2 ( aq ) ⟶ N 2 O ( g ) + H 2 O ( l ) rate = k [ O 2 NNH 2 ] [ H + ] A proposed mechanism for this reaction is:. ( 1 ) O 2 NNH 2 ( aq ) k 1 ⇌ k − 1 O 2 NNH − ( aq ) + H + ( aq ) (fast equilibrium) ( 2 ) O 2 NNH − ( aq ) k 2 −→ N 2 O ( g ) + OH − ( aq ) (slow) ( 3 ) H + ( aq ) + OH − ( aq ) k 3 −→ H 2 O ( l ) (fast)