What is the rate constant for a first order reaction if the half life of the reaction is 6.43E-5,Answer in 1/s

Answer 1

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OK, well you want the answer in 1/s but you don't state what units of the half-life are so how am I going to figure that one out?

Assuming your half-life is in seconds

t½=ln2/k

6.43x10^-5 s=ln2/k

k=ln2/6.43x10^-5 s=10780 s^-1

If your half-life is not in seconds then convert it to seconds and solve the problem using k=ln2/t½ where k is the rate constant and t½ is the half-life.