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Date: 28-9-2018
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Date: 15-1-2017
100
Date: 20-12-2020
558
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Calculation of Half-life of a First order Reaction
The integrated rate equation (4) for a first order reaction can be stated as :
where [A]0 is initial concentration and [A] is concentration at any time t. Half-life, t1/2 , is time when initial concentration reduces to 1/2 i.e.,
It is clear from this relation that :
(1) half-life for a first order reaction is independent of the initial concentration.
(2) it is inversely proportional ot k, the rate-constant.
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