You have studied the gas-phase oxidation of HBr by O2: 4 HBr1g2 + O21g2¡2 H2O1g2 + 2 Br21g2 You find the reaction to be first order with respect to HBr and first order with respect to O2. You propose the following mechanism: HBr1g2 + O21g2¡ HOOBr1g2 HOOBr1g2 + HBr1g2¡2 HOBr1g2 HOBr1g2 + HBr1g2¡ H2O1g2 + Br21g2 (b) Based on the experimentally determined rate law, which step is rate determining?

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