A solution has 1:4 molar ratio of pentan...

A solution has 1:4 molar ratio of pentane and hexane. The vapour pressure of pure hydro-carbons at `20^@C` are 440 mm Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in vapour phase would be

`0.200`

`0.478`

`0.547`

`0.786`

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