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A solution has 1:4 mole ratio of pentane...

A solution has `1:4` mole ratio of pentane to hexane . The vapour pressure of pure hydrocarbons at `20^@C`are `440` mm Hg for pentane and `120`mm Hg for hexane .The mole fraction of pentane in the vapour phase is

A

0.44

B

0.55

C

0.35

D

0.72

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