Answer
Please see the work below.
Work Step by Step
We know that
$v=\sqrt{\frac{3kT}{m}}$
We plug in the known values to obtain:
$v=\sqrt{\frac{(3)(1.38\times 10^{-23})(800)}{3.35\times 10^{-27}}}$
$v=3100\frac{m}{s}$
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