Using a packed column, ammonia is absorbed from air to water. The inlet gas contains 6% NH3 and its flow rate is 200 kmol/h. The gas released contains 0.2% NH3. Pure water is fed to the column as liquid at a flow rate of 230 kmol/h. The gas phase mass transfer unit height is known as HOG = 1.7 m and the equilibrium relation can be taken as y=0.9x under these operating conditions.

a) Calculate the column fill height. b) Find the ratio of L'/L'min used.