Question

For a first order reaction t0. 75 is 138.6 sec. Its specific rate constant is (in s^-1)
1)10^-2
2)10^-4
3)10^-5
4)10^-6​

Answer 1

Explanation:

t0.75=2t0.5

138.6=(2×0.6932)/k

k=(2×0.6932)/138.6

$k = {10}^{ - 2}$