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A gas stream containing 10 mol% ammonia is fed to an absorber in order to remove most of the NH3 before being vented to the atmosphere. This is done by absorbing it with water. The table below shows the response of the ammonia concentration in the exit gas (in ppm) to a step decrease in water flow rate from 250 gpm to 200 gpm. Time, min Outlet NH3 concentration 0 40.0 40.8 2 42.5 46.0 50.1 53.8 56.1 7 57.2 8 58.1 9 57.9 10 58.0 BOOT 19 (a) Obtain an approximate first-order-plus-dead-time model for this process using (i) the graphical process reaction curve method (via construction of the tan- gent to the response curve at the inflection point) and (ii) utilizing the times for the response to reach 28% and 63% of its steady- state change, as shown in Marlin. Be sure to use deviation variables, and report units for the model parameters. (b) Plot the data and the first-order-plus-dead-time model responses on the same axes