I ne toluowing is a proposea mecnanism tor tne gas pnase aecomposition or nitryi

Question

I ne toluowing is a proposea mecnanism tor tne gas pnase aecomposition or nitryi cnioriae. step 1 fast: NO2C1 -NO2 + Cl step 2 slow: NO2Ci+ CINO2+ C2 (1) What is the equation for the overall reaction? Use the smallest integer coefficients possible. If a box is not needed, leave it blank. (2) Which species acts as a catalyst? Enter formula. If none, leave box blank: (3) Which species acts as a reaction intermediate? Enter formula. If none, leave box blank: (4) Complete the rate law for the overall reaction that is consistent with this mechanism. Use the form k[A]" [B] , where 'l' is understood (so don't write it if it's a 'I') for m, n etc Rate- chanisms-Second Step Slow: This is group attempt 2 of 5

Explanation / Answer

(1) Adding step 1 and step 2

    2NO2Cl ------> 2NO2 + Cl2

(2) No catalyst present

(3) Cl act as reaction intermediate

(4) Let K is equilibrium constant for Step 1 reaction. And k2 is rate constant for Step 2 reaction.

As slow step, is rate determing step, so from step 2

Rate = k2 [NO2Cl] [Cl]                        ------(a)

Also, equilibrium constant for Step 1, K = [NO2] [Cl]/[NO2Cl]

or, [Cl] = K [NO2Cl]/[NO2]                 -------(b)

using (b) in (a), we get,

Rate = k2K [NO2Cl]2/ [NO2]

or, Rate = k [NO2Cl]2 [NO2]-1    where k = k2K

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