Consider an urban atmosphere containing $50ppbN{O}_x$ and $50ppb{O}_3$ with $T=298K$ and $P=1$atm, with $k_1=2\mathrm{.}2{10}^{-12}$exp$(-\frac{1430}{T})c{m}^3$ molecule ${?}^{-1}{s}^{-1},$ and $k_2=1{10}^{-2}{s}^{-1}($noon$).$

$[$:$=[NV]+{?}^{(2)}CN{O}_2\}$

$so2\mathrm{.}46{10}^{10}=1\mathrm{.}23{10}^{12}$ molec $c{m}^{-3}$

$\frac{4}{12}$

$4$

a$)$ Calculate the steady$-$state concentrations of $NO$ and $N{O}_2$ at noon based on the null cycle of reactions $1$ and $2.(4$ marks$)$ production