Consider a propane (1) + n-butane (2) system at 348.15 K. If you assume an ideal gas for this system, what will be the value of the mixture fugacity coefficient for propane when the composition of propane in the mixture is 46% by mole?
A. 0
B. 1
C. 0.46
D. 1.46
E. The pressure is required to make the calculation.
A. Incorrect. This number is not physically realistic.
B. Correct. Since this is an ideal gas, per the statement above, the mixture fugacity coefficient must be equal to 1.
C. Incorrect. The mixture fugacity coefficient is not equal to the composition.
D. Incorrect. Reread the problem statement, and review the definition of fugacity and the fugacity coefficient.
E. Incorrect. The mixture fugacity will be a function of pressure for an ideal gas, but not the fugacity coefficient.
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