Sulfur dioxide $($A$)$ diffuses through a stagnant layer of air $($B$)$ of $2cm$ thickness at $45C$ and $1\mathrm{.}2$ bar total pressure. The partial pressures of $S{O}_2$ on the two sides of the air layer are $P_{A0}=0\mathrm{.}85$ bar and $P_{AL}=0\mathrm{.}15$ bar, respectively. Considering Air is a non$-$diffusing component and DSO$2-$Air $=3\mathrm{.}5{10}^{-5}\frac{m^2}{sec},$ calculate:

i$-$ The molar flux of $S{O}_2$

ii$-$ The velocities of the individual components with respect to a stationary observer.

iii$-$ The molar and the mass average velocities of the components.

iv$-$ The molar flux of $S{O}_2$ with respect to an observer moving with the mass average velocity.