Chemistry 1b Midterm 2 Worksheet With Answers Page 6
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1
2
3
4
5
6
7
810 pts
3a)
The following data were obtained for the reaction
A+B products
[A]
(M)
[B]
(M)
mol
Initial Rate(
)
o
o
Ls
0.0500
0.100
6.0
0.100
0.100
17
0.100
0.200
34
What is the rate law?
x
y
rate
k
[
A
[ ]
B
]
Determine reaction order with respect to A
Use experiments 1 and 2
x
y
mol
6
0 .
k
. 0
0500
M
. 0
10
M
Ls
x
y
17
mol
k
. 0
100
M
. 0
10
M
Ls
x
. 0
0500
M
x
mol
. 0
353
. 0
500
Ls
x
. 0
100
M
mol
log
. 0
353
x
log
. 0
500
Ls
x
. 1
50
. 1
50
y
rate
k
[
A
]
[
B
]
Determine reaction order with respect to B
Use experiments 2 and 3
When the [B] double and the concentration of [A]
remains the same the rate doubles. Therefore,
st
reaction is 1
order with respect to [B].
rate
. 1
50
k
[
A
]
[
B
]
6 pts
3b)
If the rate law was determined to be
2
1
3 .
rate
k
[
A
[ ]
B
]
And the following data was collected
[A]
(M)
[B]
(M)
mol
Initial Rate(
)
o
o
Ls
0.0500
0.100
6.0
What is k? Remember to include units.
2
1
3 .
rate
k
[
A
[ ]
B
]
2
1
3 .
6
0 .
mol
k
. 0
0500
. 0
100
Ls
0
3 .
mol
k
120
0
3 .
L
s
6
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