lec14 - Lecture 14 Thursday Pseudo Steady State...

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Unformatted text preview: Lecture 14 Thursday 2/21/08 Pseudo Steady State Hypothesis (PSSH) Net Rate of Reaction of Active Intermediates is Zero Hall of Fame Reaction: 2NO +O 2 2NO 2 An active intermediate is a molecule that is in a highly energetic and reactive state It is short lived as it disappears virtually as fast as it is formed. That is, the net rate of reaction of an active intermediate, A*, is zero. The assumption that the net rate of reaction is zero is called the Pseudo Steady State Hypothesis (PSSH) r A* = r iA ∑ = Example The rate law for the reaction is found from experiment to be How did this rate law come about? Suggest a mechanism consistent with the rate law. A → B + C- r A = kC A 2 1 + ′ k C A For reactions with active intermediates, the reaction coordinated discussed in Chapter 3 now has trough in it and the active intermediate, A*, sits in this trough A* k 1 k 2 k 3 A+A B+C A+A +A Solution...
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This note was uploaded on 09/28/2011 for the course CHEMICAL E 534 taught by Professor Fogler during the Spring '11 term at University of Michigan-Dearborn.

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lec14 - Lecture 14 Thursday Pseudo Steady State...

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