Mole fraction of the component A in vapour phase is x1 and the mole fraction of component A in liquid mixture is x2. The total vapour pressure of liquid mixture is.
Here, p∘A= vapour pressure of pure A p∘B= vapour pressure of pure B
A
p∘A×x2x1
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B
p∘A×x1x2
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C
p∘B×x1x2
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D
p∘B×x2x1
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Solution
The correct option is Ap∘A×x2x1 By Raoult's law, pA=p∘A×x2
where, pA⇒Vapour pressure of 'A'
From Dalton's law, pA=PT×x1
where, PT⇒Total pressure of the liquid mixture
Thus, pA=x2×p∘A=x1×PT