In Problem 12-18 in this section, you used a gamma-phi modeling approach for the pentafluoroethane [R-125] (1) 1 isobutane (2) system at 308C. There (if you solved that problem), you realized the...

In Problem 12-18 in this section, you used a gamma-phi modeling approach for the pentafluoroethane [R-125] (1) 1 isobutane (2) system at 308C. There (if you solved that problem), you realized the benefit of incorporating a gamma-phi approach (i.e., treating the vapor phase as a real gas rather than an ideal gas) as compared to using modified Raoult’s law. In this problem repeat the gamma-phi modeling, but treat the vapor-phase as an ideal solution. Here, you are not including the composition effects on the fugacity coefficient, but modeling it as a pure component at the mixture temperature and pressure. Plot both results (the full gammaphi approach from Problem 12-18 and the current approach) as well as the experimental data (as symbols). Additionally, report the following information in tabular form: The experimental activity coefficients for both approaches The ratio of the mixture fugacity coefficient of component i to the saturation fugacity coefficient of component.                                                                       What can you conclude about the ideal solution approach to the vapor phase in the context of this problem?

Extracted text: TABLE P12-29 Vapor-liquid equilibrium of R-125 (1) + isobutane (2) at 30°C. P (Mpa) y, 0.4070 0.6900 0.0816 0.3998 0.7376 0.0977 0.4474 0.8492 0.1492 0.5277 0.9714 0.2085 0.5977 1.0858 0.2889 0.6515 1.2240 0.4115 0.7125 1.3412 0.5371 0.7611 1.4530 0.6894 0.8200 Based on data from B-G Lee, et al, J. Chem. Eng. Data, 2000,45, 760-763.