A first order reaction with respect ...

A first order reaction with respect to the reactact A has a rate constant of ` 6s^(-1)` . If we start with `[A] =0.5` mol / litre , then in what time the concentration of A becomes 0.05 mol / litre

`0.384s`

`0.214`s

`3.84`s

0.402s

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