22.5-3. Absorption of Ammonia in a Tray Tower. A tray tower is to be used to remove 99% of the ammonia from an entering air stream containing 6mol% ammonia at 293K and 1.013105Pa. The entering pure-water flow rate is 188kgHH2O/hm2 and the inert air flow is 128kg air /hm2. Calculate the number of theoretical trays needed. Use equilibrium data from Appendix A.3. For the dilute end of the tower, plot an expanded diagram to step off the number of trays more accurately. Ans. y1=0.000639 (exit), xN=0.0260 (exit), 3.8 theoretical trays