Two liquid having vapour pressure P1 note and P2 note in pure state in the ratio of 2:1 are mixed in the molar ratio of 1:2.The ratio of their moles in the vapour state would be

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Q. Two liquids having vapor pressure

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and

P_{2}^{o}

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are mixed in the molar ratio of

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Q. Two liquids

A

and

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A

and

B

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100

and

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the vapour pressure of two liquids A and B in their pure states are in ratio 1:2. A binary solution of A and B has A and B in mole proportion 1:2. The mole fraction of A in vapour phase of the solution will be ??

is the answer 0.33 or 0.2( because as the molefraction of A in vapour phase is used should we not use daltons law of partial pressure??)

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