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Chemical Kinetics Rate Law from Reaction Mechanism

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Consider the mechanism: Step 1: 2NO ⇌ N₂O₂ (fast equilibrium) Step 2: N₂O₂ + H₂ → N₂O + H₂O (slow) Step 3: N₂O + H₂ → N₂ + H₂O (fast) The overall rate law is:

Verified Answer & Explanation⌄

Correct Answer: A) Rate = k[NO]²[H₂]

Concept Explanation

The slow step gives Rate ∝ [N₂O₂][H₂], while the fast equilibrium gives [N₂O₂] ∝ [NO]².

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