This study investigates how Hall current, Joule heating, and a heat source effect flow, heat, and mass transfer across a chemically reacting exponentially stretching sheet in the presence of radiation and a porous medium in a viscous MHD fluid. Some similarity transformations are used to convert the nonlinear governing partial differential equations (PDEs) to nonlinear ordinary differential equations (ODEs). These nonlinear ODEs are then solved numerically using the MATLAB bvp4c approach. Graphs are used to demonstrate the impacts of numerous flow parameters such as magnetic, porosity, Hall, buoyancy, chemical reaction, and mixed convection parameters. Tables are provided to indicate how the coefficient of skin friction, Nusselt number, and Sherwood number vary when the different parameters are changed. The results are also verified using previously published data. The buoyancy parameter enhances the tangential flow velocity while retarding the cross-flow velocity, temperature profile, and concentration profile. Additionally, the hall parameter improves flow while degrading the concentration profile and temperature. Moreover, when the hall parameter increases, the rate of mass and heat transmission increases. The new results are deemed to be extremely satisfactory when compared to earlier research. This research will have a wide range of applications in various industrial and engineering appliances.