1. Ammonia is stripped from a dilute aqueous solution by countercurrent contact with air in a column containing seven sieve trays. The equilibrium relationship is: Ye = 0.8xe When the molar flow of air is 1.5 times that of the solution, 90% of ammonia is removed. a) How many ideal stages does the column have, and what is the stage efficiency? b) What percentage removal would be obtained if the air rate were increased to 2.0 times the solution rate? 2. A column with eight plates and an estimated efficiency of 75% is used to remove component A from a dilute gas by absorption in water. By what factor must the LXV ratio exceed the slope of the equilibrium line to achieve 95% removal of component A? Hint: You may need to do some trial and error at some point when answering the