Which of the following statements is true?
A.The molar entropy residual property for a liquid at low pressure is zero.
B.Calculation of the molar residual property involves solving an integral. The temperature can be considered a constant in this integral.
C.Residual properties are similar to departure functions, but with opposite signs.
D.The residual property expression for ?A is (?A_2+?A_2^ig )+(?A_2^ig+?A_1^ig )+(?A_1+?A_1^ig )
E.All of these statements are true.
A. Incorrect. All gases are modeled as ideal gases as pressure approaches zero, but a liquid is never going to behave as an ideal gas.
B. Correct. If the real process has a temperature change, then that temperature change is modeled as part of the ideal gas process that we use to mirror the real gas process, but the residual itself is calculated on an isothermal path. This is shown in Figure 6-12.
C. Incorrect. Residual property and departure function are different names for the same thing.
D. Incorrect. Remember the residual properties are the difference between real and ideal conditions. The statement is also missing some negative signs.
E. Incorrect. Only one of them is true.
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