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Question


Which of the following is a correct expression for the integrated rate law of first order reaction : AProducts ?
Here,
a=[A]0=Initial concentration of the reactant A
(ax)=[A]=Concentration of the reactant A at time t

A
[A]=[A]0kt
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B
[A]=[A]0ekt
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C
[A]0=[A]ekt
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D
[A]=[A]0+kt
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Solution

The correct option is B [A]=[A]0ekt
For a first order reaction:
AProductst=0 at=t ax
a is intial concentration i.e. [A]0 and (a-x) is the concentration at time t i.e. [A]
d[A]dt=k[A]
d(ax)dt=k(ax)
a is a constant value
dxdt=k(ax)
dxax=k.dt
x0 dxax=kt0 dt
lnaax=kt
2.303 logaax=kt
This is the integrated rate law of first order reaction
ln[A]0[A]=kt
[A]=[A]0 ekt
So, the correct option is (b)

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