Mixture of volatile components A and B has total vapour pressure (in Torr) p=254−119 xA , where xA is mole fraction of A in mixture. Hence pA∘ and p B∘are (in Torr)

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254, 119

119, 254

135, 254

119, 373

answer is C.

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Detailed Solution

Ptotal =P∘ A XA+P∘B(1−XA)PT=P∘B−XAP∘B−P∘A=254−XA119P∘B=254⇒P∘B−P∘A=119⇒254−119=P∘A∴P∘A=135

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