Answer the following statement(s) true (T) or false (F)
A. The van der Waals equation of state is a cubic equation of state, and cubic in temperature.
B. The second virial coefficient, which accounts for two-body interactions, is a function of temperature and density.
C. Simple fluids like argon, neon, etc. have acentric factors equal to 1.0.
D. The b parameter in the van der Waals equation of state is intended to describe a molecule’s size and has units of volume per mole.
E. None of the above are true.
A. Incorrect. The van der Waals EOS is cubic, but in molar volume, not temperature.
B. Incorrect. The B is a function of temperature, but not density.
C. Incorrect. The definition of the acentric factor (Equation 7.47) does not define any particular molecule or class of substances as having a certain acentric factor. However these noble gases have acentric factors close to zero (not one). For example, ?Ar = -0.004.
D. Correct. This “excluded volume” parameter corrects for the ideal gas law’s assumption of zero molar volume, which is increasingly untenable as pressure rises.
E. Incorrect. One of the statements is true.
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