NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions
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Question : 16
Total: 39
The rate constant for a first order reaction is 60 s– 1 t h
Solution:
Given, k = 60 s − 1 ,
[ R 0 ] = [ R 0 ] [ R ] =
, t = ?
Using formula,t =
log
=
log 16 = 4.62 × 10 − 2 s
Alternatively, In general, amount of the substance left after n half lives,
R =
=
∴ n = 4 t = n × t 1 ∕ 2 ;
t = n ×
= 4 ×
= 0.0462 s
Using formula,
Alternatively, In general, amount of the substance left after n half lives,
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