1. A tank is known to contain the following mixture at 45°C and 15 bar. Feed Components Ethane (A) Propane (B) n-butane (C) i-butane (D) Zi 0.31 0.34 0.21 0.14 What is the composition of the co-existing vapor and liquid phases, and what fraction of the contents of the tank is liquid? *Show your complete solution for one assumption then summarize your answers in a table for all assumptions made.

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