Answer
Please see the work below.
Work Step by Step
We can find the half life for the second order as
$t^{\frac{1}{2}}=\frac{1}{k[A]_0}$
We plug in the known values to obtain:
$t^{\frac{1}{2}}=\frac{1}{(0.413\frac{L}{mol.s})(5.25\times 10^{-3}\frac{mol}{L})}=461.2s$
