Problem: Order and rate law of a reaction. The overall order of an elementary step directly corresponds to its molecularity. Both steps in this example are second order because they are each bimolecular. Furthermore, the rate law can be determined directly from the number of each type of molecule in an elementary step. For example, the rate law for step 1 is rate = k[NO2]2. The exponent "2" is used because the reaction involves two NO2 molecules. The rate law for step 2 is rate = k[N2O4]1[CO]1 = k[N2O4][CO] because the reaction involves only one molecule of each reactant.Consider the following elementary steps that make up the mechanism of a certain reaction:2 A → B + CB + D → E + CPart A. What is the overall reaction? Express your answer as a chemical equation.Part B. Which species is a reaction intermediate?Part C. What is the rate law for step 1 of this reaction? Express your answer in standard MasteringChemistry notation. For example, if the rate law is k[A][C]3 type k*[A]*[C]^3.Part D. What is the rate law for step 2 of this reaction? Express your answer in standard MasteringChemistry notation. For example, if the rate law is k[A][C]3 type k*[A]*[C]^3.

FREE Expert Solution

Given mechanism:

2 A → B + C

B + D → E + C


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Problem Details

Order and rate law of a reaction. 

The overall order of an elementary step directly corresponds to its molecularity. Both steps in this example are second order because they are each bimolecular. Furthermore, the rate law can be determined directly from the number of each type of molecule in an elementary step. For example, the rate law for step 1 is rate = k[NO2]2. The exponent "2" is used because the reaction involves two NO2 molecules. The rate law for step 2 is rate = k[N2O4]1[CO]1 = k[N2O4][CO] because the reaction involves only one molecule of each reactant.


Consider the following elementary steps that make up the mechanism of a certain reaction:

2 A → B + C

B + D → E + C

Part A. What is the overall reaction? Express your answer as a chemical equation.

Part B. Which species is a reaction intermediate?

Part C. What is the rate law for step 1 of this reaction? Express your answer in standard MasteringChemistry notation. For example, if the rate law is k[A][C]3 type k*[A]*[C]^3.

Part D. What is the rate law for step 2 of this reaction? Express your answer in standard MasteringChemistry notation. For example, if the rate law is k[A][C]3 type k*[A]*[C]^3.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Reaction Mechanism concept. If you need more Reaction Mechanism practice, you can also practice Reaction Mechanism practice problems.