It is desired to absorb 90% of the acetone in a gas containing 1.0mol% acetone in air in a countercurrent stage tower. The total inlet gas flow to the tower is 30.0kgmol/h, and the total inlet pure water flow to be used to absorb the acetone is 108kgmolHO/h. The process is to operate isothermally at 300K and a total pressure of 101.3kPa. The equilibrium relation for the acetone (A) in the gas-liquid is yA=2.53xA. Determine the number of theoretical stages required for this separation