Consider a mixture of CH4 and H2S at 444 K and 70 bar. Use the results of Example 7.4 to plot the fugacity coeffi cient of methane as a function of methane mole fraction using the van der Waals equation of state and mixing rules. Compare the result with that obtained from the text software, ThermoSolver, using the Peng–Robinson equation of state.

EXAMPLE 7.4

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Consider a binary gas mixture composed of species a and b. Determine an expression for the fugacity of species a from the van der Waals equation of state. Use mixing rules given by Equations (7.15), (7.16), and (7.18).