c) A gas mixuire containing 10 mol% NIH, and 90 mol% air at 1 atm total pressure and 30C is to be contacted with pure water in a packed tower to remove 95% NH3. The feed gas rate is 2,000 kg/hr. The equilibrium data in mole ratio unit (30C, 1 atm total pressure) are provided as shown below. X00.00075 0.0015 0.00225 Y0 0.0030 0.004 0.100 0.025 0.050 0.075 0.112 Calculate i) the minimum operating flow rate of water? ii) the NH3 concentration in the water leaving the tower / [10 marks) 16 marks]