Question $3$

The equilibrium distribution of a solute A between air and water at low concentration at a particular temperature is given below.

$y=1\mathrm{.}2x$

At a certain point in a mass transfer device, the concentration of solute $A$ in the bulk air is $0\mathrm{.}04$ mole fraction and that in the bulk liquid phase is $0\mathrm{.}02.$ In which direction does the mass transfer of A occur $($from gas phase to liquid phase or in the opposite direction$)?$

$($a$)$Calculate the overall gas$-$phase driving forces for mass transfer.

If the individual mass transfer coefficients for the transport of A are given below. Calculate

$($b$)$ the interfacial concentrations $($c$)$ the overall mass transfer coefficient.