Question 2 [15 Marks] Determine the packing height (in feet) of a countercurrent scrubber, which is required to reduce an inlet ammonia concentradon by 85%, given the following information; liquid molar flux (water) =1000 lbmol/h. fr 2, gas molar flux (air) =700lbmol/h.ft2, mole fraction of NH3 in inlet gas =0.023, mole fraction of NH3 in outlet liquid =0.015. Assume no NH3 in inlet water stream, slope of equibrium line =0.93 and the height of a single cransfer unit (Hoc)=1.5ft