The gas-phase reaction of hydrogen and iodine monochloride, is first order in H2

Question

The gas-phase reaction of hydrogen and iodine monochloride, is first order in H2 and first order in ICl.
H2(g)+2ICl(g)?2HCl(g)+I2(g)

Part A

What is the rate law?

D.)Rate=k[H2]2[ICl

Part B

What are the units of the rate constant?

d.) M/s

12.126
A two-step mechanism has been suggested for the reaction of nitric oxide and bromine:
NO(g)+Br2(g)?NOBr2(g)
NOBr2(g)+NO(g)?2NOBr(g)

Part A

What is the overall reaction?

NO(g)+Br2(g)?2NOBr(g)

Part B

What is the role of in this reaction?

d.)reaction intermediate

Part C

What is the predicted rate law if the first step is much slower than the second step?

d.)Rate=k[NO][Br2]

Part D

The observed rate law is

What can you conclude about the rate-determining step?

A.)Rate=k[H2][ICl] B.)Rate=k[H2][ICl]2 C.)Rate=k[ICl]2

D.)Rate=k[H2]2[ICl

Part B

What are the units of the rate constant?

A.) 1/s B.) 1/(M2?s) C.) 1/(M?s)

d.) M/s

12.126
A two-step mechanism has been suggested for the reaction of nitric oxide and bromine:
NO(g)+Br2(g)?NOBr2(g)
NOBr2(g)+NO(g)?2NOBr(g)

Part A

What is the overall reaction?

2NO(g)+Br2(g)?2NOBr(g) 2NO(g)+Br2(g)?NOBr(g) NO(g)+Br2(g)?NOBr(g)

NO(g)+Br2(g)?2NOBr(g)

Part B

What is the role of in this reaction?

a.) catalyst b.)product c.)reagent

d.)reaction intermediate

Part C

What is the predicted rate law if the first step is much slower than the second step?

a.)Rate=k[NO] b.)Rate=k[NO][Br2]2 c.)Rate=k[NO]2[Br2]

d.)Rate=k[NO][Br2]

Part D

The observed rate law is

What can you conclude about the rate-determining step?

a. It must be the first step. b.It must be the second step

Explanation / Answer

A)
ans: A

B)
ans: C

12.26)
Ans: A   :2NO+Br2 -->2NOBr

B)
ans: D   :reaction intermediate

C)
ans: D

D)
ans: b

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