Ammonia is stripped from a concentrated aqueous solution containing ammonia with a mole ratio of 0.10 by contact with pure air in a multistage countercurrent stripping column consisting of four sieve trays. The equilibrium relationship in terms of mole ratios is given as: Y = 0.85 X. When the molar flow rate of pure air is 2.0 times that of the carrier (ammonia-free) liquid solution, 90 percent of the ammonia is removed. How many equilibrium stages are required, using graphical McCabe- Thiele method? How many equilibrium stages are required, using Kremser equation? What is the stage efficiency? Note: '5' = K' L'/v' cs is stripping factor) * ] In f Xa-Xa' N = In Xs - X6* I Kremser equ' Equation for operating line: - YB = YA + ( 1 ) ( X B - XA) Please note that highlighted letters indicate mole ratios, not Fractions. mole