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Consider the reaction, H2 + I2 => 2HI, which is found to be first order in I2. Which step of the proposed mechanism must be slow in order o agree with this rate law? I 2 => 2 I I + H2 => H2I H2I + I => 2 HI a) 1 b) either 2 or 3 c) 3 d) 2