Abstract
This research work investigates the existence of semianalytical solutions of a chemical kinematics model. We develop the conditions for the existence of the solutions for a proposed enzyme kinetics model, via tools of the fixed point theory. The semianalytical results were obtained with the help of Laplace transformation and Adomian decomposition method. The results established by the proposed techniques are in the form of infinite series. Furthermore, with extending homotopy perturbation method (HPM), we develop a series solutions for the considered model. By using Matlab, we present the approximate solution for both methods up to a few series terms.