Chp10_mechs

Chp10_mechs - Rate Laws and Mechanisms Mechanism series of...

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Rate Laws and Mechanisms Mechanism: series of elementary steps (rxns) to account for a complex reaction. Species formed in the mechanism and subsequently consumed – hence not appearing in the net reaction stoichiometry – are denoted as intermediates . Such species do not appear in a rate law. Species that appear in the (experimental) rate law, but (1) do not appear in the net reaction and (2) are not formed in the mechanism are denoted as a catalyst/inhibitor . Example 10.11. Consider the mechanism: fast O H N H O N slow O H O N H O N fast O N NO k k k 2 2 3 2 2 2 2 2 2 2 2 2 2 1 2 + → + + → + → with the experimental rate law: [ ] [ ] 2 2 exp H NO k R = a fast/slow reaction designates a large/small rate constant. Step I. Confirm overall/net reaction and identify species. Adding up the left-hand-side and right-hand-sides of the three mechanism steps should yield: 2 2 2 2 2 2 N O H H NO + + as the overall reaction and N 2 O 2 and
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Chp10_mechs - Rate Laws and Mechanisms Mechanism series of...

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