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im going to describe the purpose of a stripping column and then show the mass balances and then how we use those to calculate the number of equilibrium stages ill show a graphical approach lets look at the idea of a stripping column we start with a liquid that has some concentration of solute that wed like to decrease indeed in this example we go from from 0.35 parts per million down to 0.11 parts per million and we do that by contacting it with vapor the gas has a low concentration of that solute and then it leaves with a much higher concentration and if we look at the overall system we can see coming in in the liquid phase if we multiply them parts per million times the flow rate coming in is 35 moles per hour in the liquid phase and leaving in the liquid phase is 11 moles per hour so that says weve removed 24 moles per hour and if we look at the gas phase we go from 1 parts per million to 25 molar flow rate times the mole fraction indeed we have a steady state mass balance we