600 s after initiation of a first order reaction 48.5% of the initial reactant concentration remains present. what is the rate constant for this reaction?

Explanation:

For a first order reaction the rate law is:

Integranting both sides of the equation we get:

where "a" stands for [A] (molar concentration of a given reagent) and "b" is {A]0 (initial molar concentration of a given reagent), "t" is the time in seconds.

From that integral we get the integrated rate law:

therefore k is

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