Question

Your task is to calculate H^R and S^R for carbon monoxide at 400 K and 60 bar. In your own words explain what options you have for the calculations. Explain the limitations that each method may present. Also, state which method you would prefer to use if this was for a design project versus if this was on an exam.

Answer 1

We have the truncated virial equations, in this case, the truncation of the higher virial coefficients limits this method to systems at low pressures. It`s bad for high vapor densities. We can apply more accurate methods like the SRK and Peng-Robinson equations, which are cubic equations and where the last is a modification of the first.

The Peng-Robinson Method is accurate, but its calculation is long and tedious, however, the truncated virial method is less accurate but easier to estimate values of HR and SR, therefore, I would prefer to use Peng-Robinson for a design project and the truncated virial equations on an exam