NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions

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Question : 31
Total: 39
For the reaction R → P, the concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds.
Solution:  
units of minute,
Average rate =
Δ[R]
Δt

=
[R]2[R]1
t2t1

=
0.020.03
25
=
(0.01)
25

=4×104 Mmin1
In units of second,
Average rate = Δ[R]Δt
=
0.01
25×60

=6.66×106 Ms1
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