Q$2$: diffusion in solid

Hydrogen gas is maintained at pressures of $5$ bar and $1$ bar on opposite sides of a $2^x-mm-$thick membrane. The binary diffusion coefficient of hydrogen in the plastic is $9\mathrm{.}5\frac{}{b}ar({10}^{-8})\frac{m^2}{s}$ and the solubility of h$$drogen in the membrane is ${0\mathrm{.}0015}^{c}kg*mo\frac{l}{m^3}.$bar. Calculate, under uniform conditions and $25C,$ the molar diffusion flux of hydrogen through the membrane.

A$)N_{H_2}=2\mathrm{.}76{10}^{-8}kg*mol\frac{e}{s}*m^2$

B$)N_{H_2}=5\mathrm{.}62{10}^{-8}kg*mol\frac{e}{s}*m^2$

C$)N_{H_2}=2\mathrm{.}85{10}^{-7}kg*mol\frac{e}{s}*m^2$

D$)N_{H_2}=8\mathrm{.}14{10}^{-7}kg*mol\frac{e}{s}*m^2$