run Delta t (s) ln[S 2 O 8 2- ] Ln[I - ] ln(1/deltat) 1 184 -3.22 -3.22 -5.21 2
ID: 885355 • Letter: R
Question
run
Delta t (s)
ln[S2O82-]
Ln[I-]
ln(1/deltat)
1
184
-3.22
-3.22
-5.21
2
261
-3.22
-3.44
-5.56
3
345
-3.22
-3.73
-5.84
4
459
-3.22
-4.14
-6.13
5
208
-3.44
-3.22
-5.34
6
294
-3.73
-3.22
-5.58
7
471
-4.14
-3.22
-6.15
Kinetic Chemistry problem.
we have rate = k[S2O82-]n[I-]m
find n m and k
run
Delta t (s)
ln[S2O82-]
Ln[I-]
ln(1/deltat)
1
184
-3.22
-3.22
-5.21
2
261
-3.22
-3.44
-5.56
3
345
-3.22
-3.73
-5.84
4
459
-3.22
-4.14
-6.13
5
208
-3.44
-3.22
-5.34
6
294
-3.73
-3.22
-5.58
7
471
-4.14
-3.22
-6.15
Explanation / Answer
DT1/DT2 = ([I-]1/[I-]2)^m
(5.56/5.21) = ((3.44/3.22)^m)
m = 1.
(5.58/5.34) = ((3.73/3.44)^n
n = 0.54
rate = k[S2O82-]^0.54[I-]^1
[I-] = 0.0399
[S2O82-] = 0.0399
rate = dELTA[I-]/dt = 0.0399/184 = 2.168*10^(-3) M/S
k = rate/[S2O82-]^0.54[I-]^1
= 2.168*10^(-3) / ((0.0399^0.54)*0.039)
= 0.3165
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