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A first order reaction has a specific re...

A first order reaction has a specific reaction rate of `10^(-2) sec^(-1)`. How much time will it take for `20g` of the reactant to reduce to `5g` ?

A

`138.6s`

B

`346.5s`

C

`639.0s`

D

`238.6s`

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The correct Answer is:
A
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