\(=-\frac{1}{2} \frac{\Delta\left[\mathrm{N}_2 \mathrm{O}_5\right]}{\Delta \mathrm{t}}=\frac{1}{4} \frac{\left[\mathrm{NO}_2\right]}{\Delta \mathrm{t}}=\frac{\Delta\left[\mathrm{O}_2\right]}{\Delta \mathrm{t}}\)
\(\mathrm{ROR}=-\frac{1}{2} \frac{\Delta\left[\mathrm{N}_2 \mathrm{O}_5\right]}{\Delta \mathrm{t}}=-\frac{1}{2} \frac{(2.75-3)}{30} \mathrm{molL}^{-1} \mathrm{~min}^{-1}\)
\(\mathrm{ROR}=-\frac{1}{2} \frac{(-0.25)}{30} \mathrm{molL}^{-1} \mathrm{~min}^{-1}\)
\(\text { ROR }=\frac{1}{240} \mathrm{molL}^{-1} \mathrm{~min}^{-1}\)
\(\text { Rate of formation of } \mathrm{NO}_2=\frac{\Delta\left[\mathrm{NO}_2\right]}{\Delta \mathrm{t}}=4 \times \mathrm{ROR}\)
\(=\frac{4}{240}=16.66 \times 10^{-3} \mathrm{molL}^{-1} \mathrm{~min}^{-1} \simeq 17 \times 10^{-3}\)
$\mathop {2{N_2}{O_5}}\limits_{{\rm{(in}}\,\,{\rm{CC}}{{\rm{l}}_4}{\rm{)}}} \to \mathop {4N{O_2}}\limits_{{\rm{(in}}\,\,{\rm{CC}}{{\rm{l}}_4}{\rm{)}}} + {O_2}$