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Calculate the molality of ethanol soluti...

Calculate the molality of ethanol solution in which the mole fraction of water is 0.88.

Text Solution

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Mile fraction of water `(X_(A))=0.88`
Mole fraction ethanol of ethanol `(X_(B))=1-0.88=0.12`
Mass of water `=0.88xx18=15.84 g`
Now, number of modal of moles of ethanol in 15.84g of water`=((0.12mol))/((15.849))xx(1000 g)=7.57`
By definition, molality of solution=7.57m
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