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Standard XII
Chemistry
Types of Elementary Reactions
What is K in ...
Question
What is K in a first-order reaction?
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Solution
In first-order reactions, the rate of the reaction depends on the concentration of only one of the reactants.
The rate law for the first-order reaction is given as,
r
a
t
e
=
k
[
A
]
, where
k
=
rate
constant
;
[
A
]
=
concentration
of
the
reactant
.
The integrated rate law can be given as,
[
A
]
=
[
A
]
o
e
-
k
t
, graphically it shows an exponential relation between the concentration and time.
The rate constant of the first-order reaction is given as,
k
=
0
.
693
t
1
2
. Thus, the unit of the rate constant is
sec
-
1
.
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