PART B

At a particular location in a distillation column, where the temperature is $350K$ and the pressure $500mHg,$ the mole fraction of the more volatile component in the vapor is $0\mathrm{.}7$ at the interface with the liquid and $0\mathrm{.}5$ in the bulk of the vapor. The molar latent heat of the more volatile component is $1\mathrm{.}5$ times that of the less volatile component. The resistance to mass transfer in the vapor may be considered to lie in a stagnant film of thickness $0\mathrm{.}5mm$ at the interface. The diffusivity in the vapor mixture is $2{10}^{-5}\frac{m^2}{s}.$

$($a$)$ Calculate the mass transfer rates $($in kmol per $m^2$ per second$)$ of the two components.

$($b$)$ Assuming ideal gas behavior, calculate the mole fractions and concentration gradients of the two components at the mid$-$point of the film.lol