The effect of a homogeneous, irreversible second order reaction on the rate of mass transfer from a wall is studied for: (A) a flow with a uniform velocity (penetration theory), (B) a Couette flow (L6vSque theory), (C) a boundary layer flow. We present the results of this study in the form of a reaction factor FI~, that is the acceleration of the mass transfer, due to the chemical reaction, we find when we compare it with the purely physical mass transfer, in the same flow situation. The reaction factor is plotted versus a generalized Hatta number for the three flow models considered. From these graphs we conclude that the acceleration of the mass transfer by chemical reaction is insensitive to the flow situation. Nomenclature a velocity gradient at interface CA, B concentration of A, B CA Β° concentration of A at interface CB Β° initial concentration of B in fluid DA,B diffusion coefficient of A, B FI~ = (k)/(kpi~) ratio of actual mass transfer rate and rate of (purely) physical mass transfer H = (krCBoDA)}/@) generalized Hatta number kr rate coefficient second order reaction (k) average mass transfer coefficient r reaction rate