Consider the following for the below reaction at 298 O C. ______ F - (g) + (CH 3
ID: 916325 • Letter: C
Question
Consider the following for the below reaction at 298OC. ______
F- (g) + (CH3)3CBr(g) (CH3)3CF(g )+ Br-(g)
Concentration (mol/L) (mol/(L hr)
Experiment
[F-]
[(CH3)3CBr]
Initial Rate
1
2.52 x 10-6
0.75 x 10-6
5.8 x 10-8
2
2.52 x 10-6
1.50 x 10-6
1.16 x 10-7
3
4.54 x 10-6
0.75 x 10-6
5.8 x 10-8
4
5.04 x 10-6
1.75 x 10-6
TBD
a. Determine the order with respect to [F-].
b. Determine the order with respect to [(CH3)3CBr]
c. Determine the RATE LAW for this reaction based upon the data above
d. Determine the rate constant for this reaction
e. Determine the initial rate for experiment 4
Consider the PROPOSED MECHANISM below with one rate determining step.
F- (g) + (CH3)3CBr(g) (CH3)3CF(g) + Br-(g)
f. Determine the rate law for mechanism above.
g. Explain why or if the PROPOSED MECHANISM is consistent (agrees) or inconsistent (disagrees) with the data (RATE LAW) from the table above.
F- (g) + (CH3)3CBr(g) (CH3)3CF(g )+ Br-(g)
Concentration (mol/L) (mol/(L hr)
Experiment
[F-]
[(CH3)3CBr]
Initial Rate
1
2.52 x 10-6
0.75 x 10-6
5.8 x 10-8
2
2.52 x 10-6
1.50 x 10-6
1.16 x 10-7
3
4.54 x 10-6
0.75 x 10-6
5.8 x 10-8
4
5.04 x 10-6
1.75 x 10-6
TBD
Explanation / Answer
rate= k [F-]x [[(CH3)3CBr]]y
we need to find out x and y
from data
5.8 x10^-8 =k [2.52 x 10^-6]x [0.75 x10^-6]y ------------->(1)
1.16x10^-7 =k [2.52 x 10^-6]x [1.50 x10^-6]y ------------->(2)
5.8x10^-8 =k [4.54 x 10^-6 ]x [0.75 x10^-6]y ------------->(3)
by solving (1), (2) , (3)
x = 0 , y = 1
rate= k [F-]0 [[(CH3)3CBr]]1
a. Determine the order with respect to [F-].
answer : 0
b. Determine the order with respect to [(CH3)3CBr]
answer : 1
c. Determine the RATE LAW for this reaction based upon the data above
rate= k [F-]0 [[(CH3)3CBr]]1
d. Determine the rate constant for this reaction
5.8 x10^-8 =k [2.52 x 10^-6]0 [0.75 x10^-6]1
k = 0.0773 hr-
e. Determine the initial rate for experiment 4
rate = 0.0773 x 1.75 x 10-6
rate = 1.35 x 10^-7 M/hr
(f)
rate= k [F-]1 [[(CH3)3CBr]]1
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