<Dl> <Dd> − d (A) d t = r = k (A) (\ displaystyle (\ frac (- d ((\ ce (A)))) (dt)) = r = k ((\ ce (A)))) </Dd> </Dl> <Dd> − d (A) d t = r = k (A) (\ displaystyle (\ frac (- d ((\ ce (A)))) (dt)) = r = k ((\ ce (A)))) </Dd> <P> k is the first order rate constant, which has units of 1 / s or s . </P> <P> The integrated first order rate law is </P>

What is k in a first order reaction
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