Choose the words below that correctly fill in the spaces in this sentence.

The fugacity coefficient has (…) units and is defined as the fugacity divided by the (…). It has use in modeling equilibriums of mixtures.
A. no / pressure
B. pressure / fugacity
C. no / fugacity
D. pressure / Gibbs free energy
E. None of these correctly complete the sentence.


A. Correct. Fugacity coefficient is a ratio of fugacity to pressure and has no units because f has units of pressure.
B. Incorrect. Fugacity has dimensions of pressure, but the fugacity coefficient is unitless.
C. Incorrect. Fugacity divided by fugacity will always equal 1.
D. Incorrect. The fugacity coefficient and fugacity are closely related to Gibbs free energy, but they are not identical.
E. Incorrect. One of these pairs of terms completes the sentence accurately.
?

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