Mestion I

The distributed parameter model of mass transfer analysis can be used to evaluate concentration $?$ changes with position and time.

A$)$ Explain the difference between the species molar fluves $J_1$ and $N_1[$t marks$]$

B$)$ There is bulh nlow in equimolar counter$-$diffusion $($Yes No$)?$ Explain $[3$ marks$]$

C$)$ Methane $(A)$ diffuses at steady state through a tule conlaining helium $($B$)$ At point I the mole fraction of methane is $0\mathrm{.}543$ and at point $2,$ which is $30mm$ apart, the mole fraction of methane is $0\mathrm{.}148.$ The total pressure is $101\mathrm{.}32$KPa and the temperature is $20C.$ At this pressure and temperature the mutual diffusivity is $675{10}^{-5}\frac{m^2}{s}.$ Show your work clearly and:

i$)$ Calculate the steady state molar flux of methane for equimolal counter diffusion $[6$ marks$]$

ii$)$ Under conditions of $3($i$)$ above, calculated the partial pressure of methane at $2cm$ from point I $[3$ marks$]$

iii$)$ Under conditions of $Q^3($i$)$ above, calculate the molar flux of methane at $25C[4$ marks$]$