1kg per minute of mixture of solute and diluent is fed to a counter-current train of liquid- liquia extraction units. the feed has a solute mass fraction of 0.20. the desired purity of the raffinate is to be a solute mass fraction of 0.05 on a solvent free basis. pure solvent is fed at a rate of 0.2 kg/minute. a) what will the mass fraction of solute be in the actual exiting raffinate? b) what is the mass fraction of solute in the exiting extract? c) how many stages are required? (use mccabe-thiele method, generate at least five points on operating line. equilibrium data is already plotted on graph.)