A mixture comprising (30 mathrm{~mol}) per cent methane, (10 mathrm{~mol}) per cent propane and (30 mathrm{~mol}) per

Question:

A mixture comprising $30 \mathrm{~mol}$ per cent methane, $10 \mathrm{~mol}$ per cent propane and $30 \mathrm{~mol}$ per cent $n$-butane is brought to a condition of $-15^{\circ} \mathrm{C}$ at pressure $P$, where it exists as a vapour-liquid mixture in equilibrium. If the mole fraction of methane in the vapour phase is 0.80 , what is the pressure $P$ in bar?

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