A vapour mixture of (20 mathrm{~mol}) per cent methane, (35 mathrm{~mol}) per cent ethane and (45 mathrm{~mol})

Question:

A vapour mixture of $20 \mathrm{~mol}$ per cent methane, $35 \mathrm{~mol}$ per cent ethane and $45 \mathrm{~mol}$ per cent propane is available at $30^{\circ} \mathrm{C}$. Using $K$-factors, determine the pressure at which condensation begins if the mixture is isothermally compressed and also calculate the composition of the first drop of liquid formed.

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