TABLE 9 Calculated values of the speed of sound (u 0); the adiabatic coefficient (cpg) and the isochoric and isobaric heat capacities as perfect gas (Cv0 and Cp0 ), at zero pressure; acoustic virial parameters ( ba and ca) obtained using equation(2) and the deviation of these values from the equation of state GERG 2008, for the mixture (0.05 CO + 0.95 N2) at two different temperature