Tray tower providing five equilibrium stages is used for stripping ammonia from a wastewater stream by means of countercurrent air at 1 atm and 300 K. Calculate the concentration of ammonia in the exit water if the inlet liquid concentration is 0.1 mol% ammonia, the inlet air is free of ammonia, and 1.873 standard cubic meter of air are fed to the tower per kilogram of wastewater. The equilibrium data for this system, in this range of concentrations and 300 K, can be represented by yA,i= 1.414* xA,i.