Question

Part A

The following three-step mechanism has been proposed for the decomposition reaction, 2H2(g)+2NO(g)→2H2O(g)+N2(g)2H2(g)+2NO(g)→2H2O(g)+N2(g):

Step 1	2NO(g)⇌N2O2(g)2NO(g)⇌N2O2(g)
Step 2	H2(g)+N2O2(g)→H2O(g)+N2O(g)H2(g)+N2O2(g)→H2O(g)+N2O(g)
Step 3	N2O(g)+H2(g)→N2(g)+H2O(g)N2O(g)+H2(g)→N2(g)+H2O(g)

Determine the molecularity for each of the elementary steps in order.

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The following three-step mechanism has been proposed for the decomposition reaction, :

Step 1
Step 2
Step 3

Determine the molecularity for each of the elementary steps in order.

unimolecular, unimolecular, unimolecular

unimolecular, bimolecular, bimolecular

unimolecular, bimolecular, unimolecular

bimolecular, bimolecular, bimolecular

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Part B

What is the rate law for the first elementary step in the reaction mechanism shown below?

Step 1	NO2(g)+Cl2(g)→ClNO2(g)+Cl(g)NO2(g)+Cl2(g)→ClNO2(g)+Cl(g)
Step 2	NO2(g)+Cl(g)→ClNO2(g)NO2(g)+Cl(g)→ClNO2(g)

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What is the rate law for the first elementary step in the reaction mechanism shown below?

Step 1
Step 2

RateRate =k[NO2]2[Cl2]=k[NO2]2[Cl2]

Rate=k[NO2]2Rate=k[NO2]2

Rate=k[ClNO2][Cl]Rate=k[ClNO2][Cl]

Rate=k[NO2][Cl2]Rate=k[NO2][Cl2]

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Part C

For the reaction, AB+C→A+BCAB+C→A+BC, the following two-step mechanism has been proposed.

Step 1	AB+AB→AB2+AAB+AB→AB2+A
Step 2	AB2+C→AB+BCAB2+C→AB+BC

If the first elementary step is the rate-determining step for the reaction, what is the predicted rate law for the overall reaction?

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For the reaction, , the following two-step mechanism has been proposed.

Step 1
Step 2

If the first elementary step is the rate-determining step for the reaction, what is the predicted rate law for the overall reaction?

Rate=k[AB]2[C]Rate=k[AB]2[C]

Rate=k[AB]2Rate=k[AB]2

Rate=k[AB][C]Rate=k[AB][C]

Rate=k[AB2][A]Rate=k[AB2][A]

Answer 1

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