A 30 µm thick membrane having 3 m² surface area is used to separate NaCl from a solution at steady state condition. The mass transfer coefficient of NaCl at the solution side is 1×10^-6 m s^-1 and that at the other side of the membrane is 3×10^-7 m s^-1. Concentration of NaCl in the solution is 0.03 g (100 mL)^-1 and, that on the other side of the membrane is assumed to be zero. Permeability of the membrane is 9×10^-6 m s^-1. The rate of removal of the NaCl by the membrane in g h^-1 is