Question

Consider the two-step mechanism for a reaction: Step 1     NO2     +     NO2 -------> NO3     +      NO       &n

Consider the two-step mechanism for a reaction:

Step 1     NO2     +     NO2 -------> NO3     +      NO         slow; RDS

Step 2     NO3     +     CO -------> NO2     +     CO2         fast

a. What is the overall reaction?

b. Identify the intermediates in the reaction mechanism.

c. What is the predicted rate law expression? Be sure to only list reactants from the overall equation and not intermediates in the rate law expression.

Science   Chemistry   
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Answer #1

Ans :

a) The overall raction can be determined by adding the steps of the reaction and cancelling out the common terms that are present on both the sides of equation.

So here , the overall reaction is given as :

NO2 + CO = NO + CO2

b) The intermediates are the species that appear in the initial steps of the reaction and do not appear in the final product.

So here the intermediate is NO3

c) The rate law of the reaction is given on the basis of rate determining step of the reaction which is the slowest step.

So here , the rate law will be given as :

Rate = K [NO2]2

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