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