The National Ambient Air Quality Standard for nitrogen dioxide $(N{O}_2)$ in air is $0\mathrm{.}053pp{m}_v.$ What is the concentration in $\frac{g}{m^3}$ at a temperature of $25C$ and a pressure of $1$atm.

The treated discharge from an abandoned mine contains sulfate $(S{O}_4^{2-})$ at $10$mgSO$\frac{4^{2-}}{L}$ and monohydrogen sulfide $(H{S}^{-})$at $2mgH\frac{S^{-}}{L}.$ What is the total sulfur concentration in $mg\frac{S}{L}?$