A RO membrane gives the product rate (PR) and its solute content of 12.0kmol/h and 0.04molal in permeate, respectively. The pure water permeability of the membrane, A, is 1.7106kmol/m2s kPa. The feed pressure (gauge) is at 2750kPa, while the permeate pressure (gauge) is maintained at 0 . The solute transport parameter, DAMKA, and the mass transfer coefficient, k, for solute rejection is found to be 8.0106m/s and 1.5103m/s, respectively. Assume that the osmotic pressure is proportional to the salt mole fraction, i.e., =BX, where is the osmotic pressure, X is the salt mole fraction, B is the proportionality constant. Calculate: (1) water flux, JB, (2) salt mole fraction in the boundary layer, XN2, (3) membrane area, S, and (4) salt rejection, f