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if the half life of a first order reaction A is 2 mins , how lond will it take A TO reach (a) 25% of its initial concentration?

if the half life of a first order reaction A is 2 mins , how lond will it take A TO reach (a) 25% of its initial concentration?

Grade:12

1 Answers

Dibyakanti Kumar
59 Points
6 years ago
In a first order reaction the half life time is equal to 0.693/(reaction constant) which means that it is independent of the concentration of the reactant hence it is always 2 minutes . Now at half-life the concentration becomes half of the concentration we are measuring from . Therefore to reach 25% of initial which is 1/4 A requires 4 minutes i.e. two half-life time .

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