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Byju's Answer
Standard XII
Chemistry
First Order Reaction
The t1/2 of...
Question
The
t
1
/
2
of first order reaction is
60
minutes. What percentage will be left after
240
minutes?
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Solution
k
=
2.303
t
l
o
g
A
o
A
t
t
=
2.303
0.693
/
60
l
o
g
A
o
A
t
240
=
2.303
0.693
/
60
l
o
g
A
o
A
t
240
×
0.639
2.303
×
60
=
l
o
g
A
o
A
t
l
o
g
A
o
A
t
=
1.2036
Suppose
A
o
=
100
A
t
=
6.25
.
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