3. Absorption of CO₂ from air The exit gas from an alcohol fermenter consists of an air-CO₂ mixture containing 10 mol% CO₂ that is to be absorbed in a 5.0-N solution of triethanolamine, containing 0.04 mol of carbon dioxide per mole of amine solution. If the column operates isothermally at 25°C, if the exit liquid contains 78.4% of the CO2 in the feed gas to the absorber, and if absorption is carried out in a six-theoretical plate column, calculate: (a) Exit gas composition (b) Moles of amine solution required per mole of feed gas Equilibrium Data Y 0.003 0.008 0.015 0.023 0.032 -0.043 X 0.01 0.02 0.03 0.04 0.05 0.06 Y 0.055 0.068 0.083 0.099 0.12 X 0.07 0.08 0.09 0.10 0.11 Y moles CO2/mole air; X = moles CO₂/mole amine solution =