$($b$)$ Thermal decomposition of $N_2{O}_3$ in the gas phase is carried out in a Bon$-$isothermal plug flow

reactot. The overall reaction scheme is $2N_2{O}_{3}4N{O}_4+O_2.$ The proposed mechanism involve fout

eleinentary sieps as shown below.

$N_2{O}_{2}hN{O}_2+N{O}_2$

$N{O}_2+N{O}_2$longrightarrowN,$O_4$

$N{O}_4+N{O}_{4}longrightarrowN{O}_4+N{O}_4-O_2$

$NO+N_2{O}_3$longrightarrow$3N{O}_3$

Using the steady state hypotbesis show that the rate of chunge of concentration of $N_2{O}_4$ is directly

proportional to the concentration of $N_{2}O,$ itself.