A gas mixture containing $25\%$ ammonia and $75\%$ air is subjected to the absorption process with water at a speed of $0\mathrm{.}02$kmol $/$s$.$ The speed of water entering the column is $0\mathrm{.}127$kmoL$/$s$.$ The ammonia concentration in the exiting gas is $1\%.$ Its height is known as HTG $1\mathrm{.}3$m$.$ Gas phase total transfer unit load a$)$ Total filling height in the column Calculate the $.$ b$)$ If the process was carried out in a column with shelves and the column efficiency was $40\%,$ what would be the number of shelves?

Draw a graph.