A mixture containing 5 mol% ethane, 57 mol% propane, and 38 mol% n-butane is to be processed

Question:

A mixture containing 5 mol% ethane, 57 mol% propane, and 38 mol% n-butane is to be processed in a natural gas plant. Estimate the bubble-point pressure, the liquid composition, and K-ratios of the coexisting vapor for this mixture at all pressures above 1 bar at which two phases exist. Set k_ij = 0. Use the shortcut K-ratio method. Plot ln P versus 1/T for your results. What does this plot look like? Plot log K_i versus 1/T. What values do the K_i approach?

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