224 ml of triatomic gas weights 1g at 173k and 1atm .The mass of one atom of this gas is

Question

$\begin{array}{1 1}(a)\;8.30\times 10^{-23}g&(b)\;2.08\times 10^{-23}g\\(c)\;5.53\times 10^{-23}g&(d)\;6.24\times 10^{-23}g\end{array}$