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Q.

Na2S solution has a vapour pressure of 17.5 mm at a given temperature. What is the mole fraction of Na2S in this solution, If the vapour pressure of pure water is 24.5 mm at that temperature.

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answer is 0.11.

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Detailed Solution

24.5−17.524.5=13.5=in2n1+in2=3n2n1+3n2 3.5=n13n2+1 ,n1n2=7.5,n1n2+1=7.5+1=8.5 n1+n2n2=8.5  ∴n2n1+n2=18.5=0.117

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