Which of the following is the residual molar entropy of carbon dioxide at T = 400 K and P = 5 MPa, as calculated using the Peng-Robinson equation?
A. -2.42 J/mol
B. -2.42 J/mol•K
C. -3.69 J/mol•K
D. -968. J/mol•K
E. None of these
A. Incorrect. Molar entropy can have units of [J/mol•K], not [J/mol].
B. Correct. If you did this via spreadsheet, you may want to save it for future use.
C. Incorrect. You mixed up the equations for residual molar enthalpy and entropy in your calculation.
D. Incorrect. Review the equation for residual molar enthalpy in Section 7.2.7 to find your mistake (it’s on the left hand side of the equation).
E. Incorrect. One of these is the value you should obtain by calculation.
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