A thin plastic membrane separates hydrogen from air. The molar concentrations of

hydrogen in the membrane at the inner and outer surfaces are determined to be $0\mathrm{.}045$ and

$0\mathrm{.}002$kmo$\frac{l}{m^3},$ respectively. The binary diffusion coefficient of hydrogen in plastic at the

operation temperature is $5\mathrm{.}3{10}^{-10}\frac{m^2}{s}.$ Molecular Weight of hydrogen $(H_2)$ is $2\frac{g}{m}ol.$

Determine the mass flow rate of hydrogen by diffusion through the membrane under steady

conditions if the thickness of the membrane is

$($a$)2mm,$ and

$($b$)0\mathrm{.}5mm.$A thin plastic membrane separates hydrogen from air. The molar concentrations of

hydrogen in the membrane at the inner and outer surfaces are determined to be $0\mathrm{.}045$ and

$0\mathrm{.}002$ kmol$/$m$3$

$,$ respectively. The binary diffusion coefficient of hydrogen in plastic at the

operation temperature is $5\mathrm{.}3$ x$10-10$ m$2$

$/$s$.$ Molecular Weight of hydrogen $($H$2)$ is $2$ g$/$mol$.$

Determine the mass flow rate of hydrogen by diffusion through the membrane under steady

conditions if the thickness of the membrane is

$($a$)2$ mm$,$ and $($b$)0\mathrm{.}5$ mm$.$