Kinetic energy of a gas (molar mass = 32) is  $1.6\times {10}^7\mathrm{ergs}/\mathrm{mole}$. RMS velocity of the gas at the same temperature will be

$$\begin{gathered} \mathrm{KE}/\mathrm{mole}=\frac{3}{2}\mathrm{RT} \\ 3\mathrm{RT}=2\mathrm{KE}/\mathrm{mole} \\ \mathrm{RMS}\mathrm{velocity},\mathrm{C}=\sqrt{\frac{3\mathrm{RT}}{\mathrm{M}}} \\ \text{=}\sqrt{\frac{2\mathrm{KE}/\mathrm{mole}}{\mathrm{M}}} \\ =\sqrt{\frac{2\times 1.6\times {10}^7\mathrm{ergs}}{32}} \\ ={10}^3\mathrm{cm}/\mathrm{s} \end{gathered}$$