Step 1 (fast eq): A + B ⇌ C; Step 2 (slow): C + B → D. The predicted overall rate law is

rate = k[A][B]² [C] = K[A][B]; rate(slow) = k₂[C][B] = k₂K[A][B]² = kobs[A][B]².

Introduction to Reaction Mechanisms

AP Chemistry· difficulty 4/5

Step 1 (fast eq): A + B ⇌ C; Step 2 (slow): C + B \to D. The predicted overall rate law is

Explanation

[C] = K[A][B]; rate(slow) = k₂[C][B] = k₂K[A][B]² = k_obs[A][B]².

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