The rate of the decomposition of hydrogen peroxide, H₂O₂, depends on the concentration of iodide ion present. The rate of decomposition was measured at constant temperature and pressure for various concentrations of H₂O₂ and of KI. The data appear below. Determine the order of reaction for each substance, write the rate law, and evaluate the rate constant.

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Rate (mL min-¹) 0.090 0.178 0.184 [H₂O₂] (mol L-¹) 0.15 0.30 0.15 [KI] (mol L-¹) 0.033 0.033 0.066