In a counter current stripping operation using pure steam the mole ratio of a solute in the liquid stream is reduced from 0.25 to 0.05. The liquid feed flow rate, on a solute free basis, is 8 mol/s. The equilibrium line for the system is given in the figure below. 0.15 0.1 Mole ratio in the gas phase y Equilibrium lins 0.05 0 0.05 0.1 0.15 0.2 0.25 Mole ratio in the liquid phase, x The minimum flow rate of pure stream for this pro- cess, rounded to 1 decimal place, is mol/s