c) Show that the relationship between the mole ratio of the solute in the gas and liquid streams (operating line) for a steady state countercurrent gas absorption tower is given by; (4 marks) L' Y = V'Y - L'X, V' Where; Y, = mole ratio of solute in gas phase exiting the column, X,-mole ratio of solute in liquid phase entering the column, L'= molar flow rate of non-transferable component in the liquid stream, V = molar flow rate of the incrt gas