A gas stream in a chemical process enters a packed-bed gas absorption column with 50% ammonia and the balance air that needs to be have ammonia removed. The gas comes into contact with a pure stream of liquid water in the gas absorption column that is running countercurrent to the gas stream and flows from the bottom of the column. The gas runs at a flow rate of 45 m³/s, with a temperature of 400K and pressure of 105 kPa. The pure water stream absorbs 88% of the ammonia. You may also assume that no air is absorbed by the water stream and that there is negligible water loss due to evaporation. The column is cylindrical and has an internal diameter of 1.5 m. (a) What is the mole fraction of ammonia leaving the gas absorption column? (b) What is the outlet gas mass velocity (this is the mass flow rate divided by the cross- sectional area of the column)?