1000 kmol/h of air containing 100 ppm (mole basis) of CHCl₃ at 25 C and 2 atm has to be cleaned up before recycling the air in a chemical plant. We plan to absorb the solute of interest using pure water at 25 C. The gas absorption operation is to be carried out at L/G = 1.4(L/G)_min. If 20 ppm of solute in the outlet air stream is acceptable, how many equilibrium stages are needed in the absorber unit? Note that, based on Henry's law constant for CHCl₃ in water at 25 C, 1 atm is 211.19 atm/mole frac, the solubility curve of the solute in water needed to solve this problem is provided here. Solve the problem graphically using the McCabe-Thiele method to determine the number of equilibrium stages needed.