A gas stream entering a tray absorption tower contains 27 mol% ammonia while the rest inert gases. The tower is designed to operate at 303 K and 1.013 x 10⁵ Pa pressure. Water consisting of 0.005 mol frac. ammonia is used as the scrubbing liquid. The total gas flow coming in is 175 kg mol/h. It is expected that the ammonia will be reduced to 2.5 mol% at the gas outlet.
Calculate the minimum liquid flow L 'min
