Acetone from a mixture with air containing 2 mol% acetone is absorbed counter-currently in water in a plate tower containing four theoretical stages. The inlet gas rate is 40 kmol/h and acetone-free water is supplied to the column at a rate of 110 kmol/h. The equilibrium relation is y = 2.5x. Determine the concentration of the solute in the exit liquid using Kremser analytical method.

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