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Ch_13_III_Mechanisms

Ch_13_III_Mechanisms - Part IIMechanisms of Chemical...

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Sheet1 Page 1 Part II°Mechanisms of Chemical Reactions First part: we determined the rate of overall reactions NO g + CO g . NO g + CO g 2 ()( ) ( ) 2 ( ) Rate Err:520 kNO . from experimental data [ 2 ]2 This part: we examine elementary steps of reaction hWhy this reaction is second-order with respect to [NO2]. h Why this reaction is zero-order with respect to [CO]. h What the reaction mechanism is, that is, the elementary steps of the reaction? t NO g +CO g .NO g +CO g
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Sheet1 Page 2 2 ()( ) ( ) 2 ( ) Takes place in two elementary steps (or reactions): NO g +NO g .NO g +NO g (Step 1) 2 ( ) 2 ( ) 3 ( ) ( ) NO g +CO g . NO g +CO g (Step 2) 3 ( ) ( ) 2 ( ) 2 ( )
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Sheet1 Page 3 Two necessary, but not sufficient, conditions for a correct reaction mechanism: h The sum of the elementary steps = overall reaction h Mechanism predicts correct experimental reaction order NO g +CO g .NO g +CO g 2 ()( ) ( ) 2 ( ) CHECK: the sum of the elementary steps = overall reaction NO g +NO ( g ).NO g +NO g (Step 1) NO () g +CO g ().NO ( g )+CO ( g ) (Step 2)
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Sheet1 Page 4 2 ( ) 23 ( ) ( ) 3 22 2 ()+CO g ().NO g +CO 2 ( ) NO g ( ) g NO3 is called an intermediate species or an intermediate Intermediates are very reactive and have very small concentrations. c DigressionH Elementary Steps (Reactions) Rare R 1 NO g +NO g ...NO g +NO g (Step 1) 2 (
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