we have:
[A]o = 0.7 M
[A] = 0.22 M
k = 0.51 M-1.s-1
use integrated rate law for 2nd order reaction
1/[A] = 1/[A]o + k*t
1/(0.22) = 1/(0.7) + 0.51*t
4.545 = 1.429 +0.51*t
0.51*t = 3.117
t = 6.112 s
Answer: 6.11 s
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