Question: A mixture containing 15-mol-% ethane, 35-mol-% propane, and 50-mol-% n-butane is brought to a condition of 40 C at pressure P. If the molar fraction

A mixture containing 15-mol-% ethane, 35-mol-% propane, and 50-mol-% n-butane is brought to a condition of 40 C at pressure P. If the molar fraction of liquid in the system is 0.40, what is pressure P (in bar) and w hat are the compositions of the liquid and vapor phases?

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