Answer
Please see the work below.
Work Step by Step
We know that
$u_{330k}=(\frac{3RT}{M})^{\frac{1}{2}}$
We plug in the known values to obtain:
$U_{330k}=(\frac{3\times 8.31\times (57+273)}{352\times 10^{-3}})^{\frac{1}{2}}=1.528\times 10^2\frac{m}{s}$
