The reaction 2 NO + 2 H₂ → N₂ + 2 H₂O is second order in [NO] and first order in [H₂]. A three-step mechanism has been proposed. The first, fast step is the elementary process given as equation (20.25). The third step, also fast, is N₂O + H₂ → N₂ + H₂O. Propose an entire three-step mechanism, and show that it conforms to the experimentally determined reaction order.

Eq. 20.25

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Fast: k₁ k1 2 NO(g) N₂O₂(g) (20.25)