A predictive model based solely on the conservation equations of both phases is presented for the study of the effect of the gas-side resistance in multicomponent absorption with chemical reaction in a laminar liquid film. The model is applicable for short exposure times to a variety of flow patterns, e.g. a cylindrical jet, a wetted-wall column, or an inclined plane. The model may be applied to the wetted-wall column and the inclined plane for any contact time. The numerical scheme for the downstream solution has the advantage of utilising a similarity solution as its starting point. The model is applied to the system CS₂---N₂ where CS₂ is absorbed in an aqueous solution of amine and undergoes pseudo first order reaction. It was found that the a priori neglect of the gas-side resistance is not justified. The error introduced in evaluating the absorption flux by neglecting the gas-side resistance is dependent on the reaction rate constant, bulk concentration of the species, length of the absorber and the total pressure. Errors generally increased with increasing values of the above parameters. The gas-side resistance is reduced when the gaseous atmosphere is under forced convection.