In packed bed gas absorbers, if we conduct a mass balance for the pollutant, we obtain that the number of moles of pollutant lost in the gas stream will be gained by the liquid stream. This relation can be written as below if we use the total molar flow rates: y1Gm,1y2Gm,2=x1Lm,1x2Lm,2 If we want to write this mass balance in terms of Gc and Ls, then we get: Gc(Y1Y2)=Ls(X1X2) Show briefly how the mass balance given in Eq. 1 can be written in terms of mole ratio as given in Eq.2