All the experimental parameters were compared to those calculated according GERG-2008 equation of state. The deviations calculated were lower to 1% for every parameter except the first acoustic viral coefficient, a comparison was made between speed of sound using GERG-2008 equation of state, REFPROP 9.0 [12] and on the other hand, the speed of sound calculated from acoustic virial coefficients according REFPROP 9.0 and they do not match being closer to the experimental results the ones provided by GERG-2008.