period of first order reaction is 20 minutes the time required the concentration of the reactant to change form m 0.1 6 a.m. to 0.02 M is
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The half life period of a first order reaction is 20 minutes.
t
1/2
=20 minutes.
The rate constant k=
t
1/2
0.693
=
20min
0.693
=0.03465/min
The time required for the concentration of the reactant to change from 0.16M to 0.02M
is t=
k
2.303
log
a−x
a
=
0.03465/min
2.303
log
0.02
0.16
=60min
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