Order and rate law of a reaction The overall order of an elementary step directl
ID: 990929 • Letter: O
Question
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[NO3]1[CO]1=k[NO3][CO]
because the reaction involves only one molecule of each reactant the exponents are ommitted.
Analyzing a new reaction
Consider the following elementary steps that make up the mechanism of a certain reaction:
2AB+C
B+DE+C
Part A
What is the overall reaction?
Express your answer as a chemical equation.
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Part B
Which species is a reaction intermediate?
Which species is a reaction intermediate?
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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.
Rate =
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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.
Rate =
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Explanation / Answer
Given elementary steps that make up the mechanism of a certain reaction are:
2AB+C ………….1
B+DE+C ………..2
Part A
What is the overall reaction?
Express your answer as a chemical equation.
Answer:
The overall reaction is the sum of eq. 1 & 2
2AB+C ………….1
B+DE+C ………..2
Overall reaction : 2A + D è E + 2C …………3
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Part B
Which species is a reaction intermediate?
Which species is a reaction intermediate?
Answer:
The reaction intermediate is “species B”
A
B
C
D
E
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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.
Answer:
The step 1 in the given reaction is
2AB+C ………….1
Rate = k1*[A]^2
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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.
Answer:
The step 2 in the given reaction is
B+DE+C ………..2
Rate = k2*[B]*[D]
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A
B
C
D
E
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