Question

Determine the units of the rate constant for all four reactions listed in the problem above, and enter the correct choices from the list below. Enter 4 letters in order (e.g. ABCD or CBED)a. mole L-1 sec-1

b. mole-1 L sec-1
c. mole2 L-2 sec-1
d. mole-2 L2 sec-1
e. None of the above.

Answer 1

The given question is incomplete. The complete question is :

For the net reaction:
`2AB+2C\rightarrow A_2+2BC`, the following slow first steps have been proposed.

A.
`2C+AB\rightarrow AC+BC`

B.
`2AB\rightarrow A_2+2B`

C.
`C+AB\rightarrow BC+A`

D.
`AB \rightarrow A + B`

Determine the units of the rate constant for all four reactions listed in the problem above, and enter the correct choices from the list below. Enter 4 letters in order (e.g. ABCD or CBED)

a.
`moleL^(-1 )sec^(-1)`

b.
`mole^(-1)Lsec^(-1)`

c.
`mole^2L^(-2)sec^(-1)`

d.
`mole^(-2)L^2sec^(-1)`

e. None of the above.

Answer: A.
`2C+AB\rightarrow AC+BC` :
`mol^(-2)L^2s^(-1)`

B.
`2AB\rightarrow A_2+2B` :
`k=mol^(-1)Ls^(-1)`

C.
`C+AB\rightarrow BC+A` :
`k=mol^(-1)Ls^(-1)`

D.
`AB \rightarrow A + B`:
`k=s^(-1)`

Step-by-step explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

1.
`2C+AB\rightarrow AC+BC`

`Rate=k[C]^2[AB}^1`

`molL^(-1)s^(-1)=k[molL^(-1)]^2[molL^(-1)}^1`

`k=mol^(-2)L^2s^(-1)`

2.
`2AB\rightarrow A_2+2B`

`Rate=k[AB]^2`

`molL^(-1)s^(-1)=k[molL^(-1)]^2`

`k=mol^(-1)Ls^(-1)`

3.
`C+AB\rightarrow BC+A`

`Rate=k[C}^1[AB]^1`

`molL^(-1)s^(-1)=k[molL^(-1)]^1[molL^(-1)]^1`

`k=mol^(-1)Ls^(-1)`

4.
`AB \rightarrow A + B`

`Rate=k[AB]^1`

`molL^(-1)s^(-1)=k[molL^(-1)]^1`

`k=s^(-1)`