The thermal decomposition of nitryl chloride is proposed to occur by the followi

Question

The thermal decomposition of nitryl chloride is proposed to occur by the following mechanism: step 1 slow: NO2Cl NO2 + Cl step 2 fast: Cl + NO2Cl NO2 + Cl2 (1) What is the equation for the overall reaction? Use the smallest integer coefficients possible. If a box is not needed, leave it blank. Cl + NO2Cl NO2 + Cl2 (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]m[B]n... , where '1' is understood (so don't write it) for m, n etc.) Rate =

Explanation / Answer

step 1

slow:

NO2Cl = NO2 + Cl

step 2

fast:

Cl + NO2Cl = NO2 + Cl2

overall reaction

Add the two reactions

NO2Cl + NO2Cl + Cl NO2 + Cl + NO2 + Cl2

2NO2Cl 2NO2 + Cl2

rate law is determined by the slow step.

rate = K[NO2Cl]

intermediate is chlorine radical Cl.

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