Consider the reaction, H2 + I2 => 2 HI , which is found to be half order in I2 and first order in H2. Which step of the proposed mechanism must be slow in order to agree with this rate law? I 2  => 2 I             I + H2 => H2I          H2I + I => 2 HI

Chemistry & Chemical Reactivity
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Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
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Chapter14: Chemical Kinetics: The Rates Of Chemical Reactions
Section14.7: Reaction Mechanisms
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Consider the reaction, H2 + I2 => 2 HI , which is found to be half order in I2 and first order in H2. Which step of the proposed mechanism must be slow in order to agree with this rate law?

2  => 2 I            

I + H2 => H2I         

H2I + I => 2 HI  

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