wiz-icon
MyQuestionIcon
MyQuestionIcon
9
You visited us 9 times! Enjoying our articles? Unlock Full Access!
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
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
[A]=[A]0ekt
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
[A]0=[A]ekt
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
[A]=[A]0+kt
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
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)

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon