Predict the Pxy behavior for a mixture of pentafluo-roethane [R-125] (1) + isobutane (2) at 30C using

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Predict the Pxy behavior for a mixture of pentafluo-roethane [R-125] (1) + isobutane (2) at 30°C using the Peng-Robinson equation of state. Compare the predicted values with experimental data given in Table P12-17. How would you suggest improving the modeling results from the Peng-Robinson equation relative to the experimental data?

FF F-C-C-H II FF Pentafluoroethane

TABLE P12-17 Vapor-liquid equilibrium of R-125 (1) + isobutane (2) at 30C. P (MPa) 0.4070 0.6900 0.7376

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