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JEE Main Chemistry question

ChemistrySolutionsJEE Main

A solution has a 1:4 mole ratio of pentane to hexane. The vapour pressures of the 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 would be

Answer: (C)

Solution

Liquid mole fractions: , . Partial pressures: mm,

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Question ID VK-143289