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Two liquids A and B have vapour pressure...

Two liquids `A` and `B` have vapour pressure of `0.600` bar and `0.2` bar, respectively. In an ideal solution of the two, calculate the mole fraction of `A` at which the two liquids have equal partial pressures.

Text Solution

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Let the mole fraction of `A = chi`
Mole fraction of `B = 1-chi`
Partial pressure of `A = 0.6chi`
Partial pressure of `B = 0.2 (1-chi)`
or `0.6chi = 0.2(1-chi)`
`chi = 0.25`
Hence, the mole fraction of `A = 0.25`.
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