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Calculate the partial vapour pressure of...

Calculate the partial vapour pressure of `C_(2)H_(4)Br_(2) at 85^(@)C` for an ideal solution with mole fraction of 0.25. Vapour presure of pure `C_(2)H_(4)Br_(2) at 85^(@)C` is 170 mm Hg.

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The correct Answer is:
42.5mm Hg
`P_(A)=P_(A)^(@)X_(A)=170mmxx0.25=42.5 mm Hg`.
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