we have:
[A]o = 100 M
[A] = 6.25 M
k = 4.5*10^-3 s-1
use integrated rate law for 1st order reaction
ln[A] = ln[A]o - k*t
ln(6.25) = ln(1*10^2) - 4.5*10^-3*t
1.833 = 4.605 - 4.5*10^-3*t
4.5*10^-3*t = 2.773
t = 6.161*10^2 s
Answer: 6.16*10^2 s
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