A gas mixture containing 2 % A and 98 % B is to be contacted by a pure liquid in a packed absorption tower. The concentration of species A in the gas stream is to be reduced to 0.5%. The gas and liquid flow rates are 100 and 2000 kgmol/(h.m) respectively. The overall mass transfer coefficient for the gas phase is K'ja = 100 kgmol/(h.m). Using the equilibrium data given below, determine the tower height. 0.003 0.043 XA 0.023 0.002 0.0627 0.006 0.0826 0.008 0 0.004