Question #4856

I have a little question.
A mixture of CO2 and N2 gases has an experiment density of 21922 mol/m3 at T=225K and Pressure= 68.759 MPa and Z=1.67661. What is density of this mixture of gases in mol/m3 by Peng-Robinson equation of state? (Mole fraction of Co2= 10.56%)

Expert's answer

Using Peng-Robinson equation of state can be given by:

Z = PV_{m}/RT

V_{m} - molar volume of gases mixture

Hence, density in mol/m^{3} can be given by:

ρ = 1/V_{m} = 1/(4.5614×10^{-5}) = 21923.094 mol/m^{3}

Z = PV

V

Hence, density in mol/m

ρ = 1/V

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