One of the major differences between the van der Waals equation of state and the Peng-Robinson equation of state to model the vapor-liquid equilibrium of mixtures is:
A. The van der Waals equation of state does not use the acentric factor for its parameters, but the Peng-Robinson equation of state does.
B. The van der Waals equation of state uses a temperature-dependent a parameter, while the Peng-Robinson equation of state does not.
C. The van der Waals equations of state does not use a binary interaction parameter, but the Peng-Robinson equation of state does.
D. The van der Waals equation of state will never show an azeotrope, but the Peng-Robinson equation of state can.
E. None of the above.
A. Correct. The acentric factor is not used in the parameter definitions for VDW, but it is used in the PREOS. One important reason why this is true is that the acentric factor was presented after the VDW equation of state was developed, but before the PR equation of state was developed.
B. Incorrect. The VDW equation of state does not use a temperature-dependent a parameter.
C. Incorrect. Both can use such a parameter (k12). Try again.
D. Incorrect. Both can reproduce an azeotrope with the proper set of parameters.
E. Incorrect. One statement is correct.
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