A sintered solid of silica 2.0mm thick is porous with a void fraction of 0.3 and a tortuosity of 4 . The pores are filled with water at 298K. At one face the concentration of 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 KCl at steady state. DrC-water =1.87103m2/s