The mixing ratio of $\mathrm{CO}_{2}$ at a pressure of $1$ $\mathrm{atm}$ and at $300$ $\mathrm{K}$ is reported as $340$ $\mathrm{ppmv}$.
Considering ideal gas conditions, the equivalent concentration of $\mathrm{CO}_{2}$ in air is $\_\_\_\_\_\_$
$\mathrm{mg} / \mathrm{m}^{3}$ (rounded off to two decimal places).
The molecular weight of $\mathrm{CO}_{2}=44 \mathrm{~g} / \mathrm{mol}$
Universal gas constant $=8.314 \mathrm{~J} / \mathrm{mol}-\mathrm{K}$
