Answer
Please see the work below.
Work Step by Step
We know that
$v_{rms}=\sqrt{\frac{3RT}{M}}$
We plug in the known values to obtain:
$v_{rms}=\sqrt{\frac{3\times8.314\times 1.7\times 10^{-7}}{0.085}}=0.00706\frac{m}{s}$
Now $KE=\frac{1}{2}Mv_{rms}^2=\frac{1}{2}\times 0.085\times (0.00706)^2=0.0003J$
