How to find k for complex rate eqn?

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How to find k for complex rate eqn?

Postby Chem_Mod » Sun Oct 02, 2011 2:01 am

At the very end of a problem, it shows that [k3k2k1^(1/2)]/[k-2k-1^(1/2)] cancels out to "k". I understand that k2/k-2=1 and same with the k1 and k-1 because they are fast and at equilibrium, but shouldn't the finals answer be rate= k3[CO][Cl2]^3/2 instead of just "k"? (Spring 2004 Sample midterm Q5)

Chem_Mod
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Re: How to find k for complex rate eqn?

Postby Chem_Mod » Sun Oct 02, 2011 2:02 am

If we generate a complex rate constant equation like the one in this question, it is common to consider the entire unit as a whole and call it k for the reaction as seen on page 503 in Atkins, part 10b. This way the rate law agrees with the mechanism.


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