here:
[A] = 0.230 M
[A]o = 0.600 M
use integrated rate law for 1st order reaction
ln[A] = ln[A]o - k*t
ln(0.230) = ln(0.600) - 0.230*t
-1.470 = -0.511 - 0.230*t
0.230*t = 0.959
t = 4.169 s
Answer: 4.169 s
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