Due to the large amount of compounds present in the crude oil, for example, hydrocarbons and carbon dioxide, it is necessary knowledge of the thermodynamic properties of these mixtures and the vapor-liquid equilibrium, as industrial processes for obtaining their derivatives gasoline, diesel, naphtha, kerosene, among others, use these properties to determine the quantities of heat and work necessary to carry out these processes. For fluid, these properties are often evaluated from measurements of the molar volume as a function of temperature and pressure, providing relationships between pressure, volume and temperature (PVT), which can be expressed as state equations. This paper consists to list the experimental data in literature CO2 balance - CH4/C2H6 /C3H8/C4H10 to various temperatures and pressures and using the cubic equation of state Peng-Robinson and Van der Walls quadratic mixing rule (QMR / k) SPECS through the simulator in order to provide a basis for quantitative description of the actual behavior of fluids and generalized correlations which allow the prediction of PVT behavior of fluids for which there is availability of experimental data.