$r_0=1mm$ at $1450k$ and latm.

$C_{(s)}+O_{2(g)}C{O}_{2(g)}$

The reacton rate is furt order and of the fam $N{O}_2=-k_1*C\frac{o_2}{?}$ rol where $k_1=0\mathrm{.}1\frac{m}{s}$ a$)$ mass troster equation by stating assumptions.

b$)$ Fick's law bly showing all the simplification.

C$)$ Define boundary conditions and find morflux of oxygen $N{O}_2$

d$)$ Determine the steady$-$state $O_2$ polar consumtion rate, $W_2$ in kmo$\frac{l}{s}($diffision coefficent for $O_2$ and $O_2=-1\mathrm{.}71{10}^{-6}\frac{m^2}{s})$