Mass transfer operations

A A-B gas mixture containing 5 mole %A is scrubbed with pure water in a countercurrent packed column of 1.5m dia to remove 95% of A. The gas enters at the rate of 3000kg/h and the liquid rate is 50% more than the minimum. The overall mass transfer coefficient KGa is 1.1kmol/m3h(kPa). Equilibrium data at the operating conditions are (x,y are mole fractions of A): The molecular weight of solute A is 58g/mol, and the carrier gas B has molecular weight 29 g/mol. Determine a) The liquid rate in kg/h b) The mole percent of A in the exit liquid [2] c) Given that NtOG=6.98, determine the height of the column [1]