Q$7.$ A gar of $C{H}_4$ and the is contained in a tube at $101\mathrm{.}32kP$ tutal pressure. At one point the partial pressuce of methane is $60\mathrm{.}79K$ and at a point $0\mathrm{.}02m$ distance away, the pattial pressure is $20\mathrm{.}26$kPa.

$($a$)$ Plot the relationship betwen the diffusivity of methane and semperature at constant pressure of $101\mathrm{.}32$KPa.

$($b$)$ Plot the flux vs$.$ temperature for transport of methane at steady$-$state for equimolar counter$-$diffusion.

Assume temperature values in the range of $25i-150$ i$.$