A suggested mechanism for the reaction of nitrogen dioxide andcarbon monoxide is

Question

A suggested mechanism for the reaction of nitrogen dioxide andcarbon monoxide is

Step I NO2 + NO2 --> NO3 + NO (slow)
Step II NO3 + CO --> NO2 + CO2 (fast)
Which of the followingstatements are true? There may be more than one correctanswer. a) Step II is the rate determining step b) For therate determining step : rate = k[NO2][NO2] c) The overallreaction is 2NO2 + CO --> 2NO + CO + O2 d) Theexperimental rate law is k[NO2] A suggested mechanism for the reaction of nitrogen dioxide andcarbon monoxide is

Step I NO2 + NO2 --> NO3 + NO (slow)
Step II NO3 + CO --> NO2 + CO2 (fast)
Which of the followingstatements are true? There may be more than one correctanswer.

Explanation / Answer

a. False. The slowest step is the rate determining step. b. True. Step 1 is the rate determining step. To write the ratelaw, just use the reactant, and the coefficients represent thepower. So for step 1. rate = k[NO2][NO2] c. False. To write the overall reaction, eliminate theintermediates (appear on both sides of the equation). So the reaction is : NO2+ CO -> NO + CO2 d. False. Based the law off of the slowest step. rate =k[No2][NO2]or just rate = k[NO2]2. Since NO2 is in the overallreaction (look at part c), there is no need to do any changes; thatis also the exp rate law.

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