60kgmol/hr of an air stream is contaminated with 6mol% of solute A and it is desired to remove solute A in counter-current absorption tower. The total pure water entering the absorber tower is 165kg mol/hr. The process is operated isothermally at 25C and at a total pressure of 1 atm. The outlet water stream has a composition of 2 mol\% solute A. The equilibrium compositions of A in air and water are given by y=1.8x. a) Determine the flow rate of solute A at the outlet water stream and the flow rate of air in the outlet stream. (5 marks) b) Evaluate the theoretical number (N) of stages using Kremser equation. (8 marks) c) Why does the value of absorption factor (A) vary if the equilibrium line is a curved line? (2 marks)