(Solved): A sintered solid of silica 2.0mm thick is porous with a void fraction of 0.3 and a tortuosity ...

A sintered solid of silica $$2.0\mathrm{mm}$$ thick is porous with a void fraction of 0.3 and a tortuosity of 4 . The pores are filled with water at $$298\mathrm{K}$$. At one face the concentration of $$\mathrm{KCl}$$ is held at 0.1 gmol/liter, and fresh water flows rapidly by the other face. Neglecting any other resistance but that in the porous solid, calculate the diffusion of $$\mathrm{KCl}$$ at steady state. DrC-water $$=1.87\times 10^{?3}{\mathrm{m}}^2/\mathrm{s}$$.