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This work presents a numerical tool implemented to simulate inviscid and viscous flows employing the reactive gas formulation of thermal and chemical non-equilibrium. The Euler and Navier-Stokes equations, employing a finite volume formulation, on the context of structured and unstructured spatial discretizations, are solved. These variants allow an effective comparison between the two types of spatial discretization aiming verify their potentialities: solution quality, convergence speed, computational cost, etc. The aerospace problem involving the hypersonic “hot gas” flow around a blunt body, in three-dimensions, is simulated. The reactive simulations will involve an air chemical model of five species: N, O, N2, O2 and NO. Seventeen chemical reactions, involving dissociation and recombination, will be simulated by the proposed model. The Arrhenius formula will be employed to determine the reaction rates and the law of mass action will be used to determine the source terms of each gas species equation. In this first part, only the structured solutions are presented. The unstructured solutions are shown in the second part of this study.