Problem 2: (40 marks) Acetone is contained in air (2 mol% initial concentration) and it is required to decrease the amount of acetone in air in such a way to remove 80% of the acetone originally present. The absorption is done counter currently by using 75 kmol/hr of fresh water. If 24 kmol/h air is entering and the process is to operate isothermally at 300 K and a total pressure of 101.3 kPa, determine the number of theoretical stages required. The equilibrium relation for the solute (acetone) is Yacetone = 3.1 Xacetone You need to show both numerical and graphical methods