The following data were obtained by Chamber and Sherwood on the absorption of ammonia from an ammonia-air system by a strong acid in a wetted wall column 0.575 in. in diameter and 32.5 in. long:The operation was countercurrent, with the gas entering at the bottom of the vertical tower and the acid passing down in a thin film on the inner wall. The change in acid strength was inappreciable, and the vapor pressure of ammonia over the liquid may be assumed to have been negligible because of the use of a strong acid for absorption. Calculate the mass-transfer coefficient, kp, from thedata.

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Iniet acid (2-N H;SO4) temperature, "F Outlet acid temperature, F Inlet air temperature, F Outlet air temperature, "F Total pressuse, atm Partial pressure NH, in inlet gas, atm Partial pressure NH, in outlet gas, atm Air rate, Ibmol/h 76 81 77 84 1.00 0.0807 0.0205 0.260