Problem: The rate constant for this first order reacion is 0.400 s-1 at 400°C.A → products How long (in seconds) would it take for the concentration of A to decrease from 0.600 M to 0.200 M?

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The rate constant for this first order reacion is 0.400 s-1 at 400°C.

A → products 

How long (in seconds) would it take for the concentration of A to decrease from 0.600 M to 0.200 M?

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