Which of the following is the residual molar enthalpy of toluene at T = 600 K and P = 2.5 MPa, as calculated using the Peng-Robinson equation?
A. -2.27 kJ/mol
B. -0.853 kJ/mol
C. -4.20 kJ/mol
D. -6.04 kJ/mol
E. None of these
A. Incorrect. You probably assumed or calculated Z as being close to 1. At these conditions ideal gas assumptions do not work. Use Section 7.2.7 to find Peng-Robinson in terms of Z.
B. Incorrect. This is the correct numerical value of HR/RTc. You now need to calculate HR.
C. Correct. This was a lengthy calculation.
D. Incorrect. You seem to have used critical pressure instead of system pressure in some calculations. Review Section 7.2.7 and make corrections.
E. Incorrect. One of these is the correct value.
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