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Half-life and methods to determine order
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Difficulty 1 of 3
ck065
A first order reaction has
k
=
0.0231
mi
n
−
1
. Using
ln
2
=
0.693
, its half-life is
A
43.3
min
B
0.0333
min
C
30.0
min
D
0.0160
min
Answer: C
For first order
t
1/2
=
0.693/
k
=
0.693/0.0231
=
30.0
min
. The value 43.3 min results from using
1/
k
, which is not the half-life formula.
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