A solution has a 1:4 mole ratio of penta...

A solution has a 1:4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbon at `30^(@)C` are 440 mm Hg for pentane and 120 mmHg for hexane. The mole fraction of pentane in the vapour phase at `30^(@)C` is

0.2

0.478

0.549

0.786

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