1.

Calculate molefractionof solutein its 2 molalaqueoussolution .

Answer»


SOLUTION :GIVEN :Concentrationof solution=2 molal = 2 m
Hence 2 molesof a solutearepresentin 1000gramswater .
`:. W_(H_(2)O) =100 g`
`:.` Numberof molesof water `=n_(H_(2)O) =(W_(H_(2)O))/(M_(H_(2)O))`
`= (1000)/(18)`
`=55.56 `MOL
`:. ` Totalmolesin solution`=n_(H_(2)O) + n_(solute)`
`=55.56 +2`
` = 57 .56 `mol
`:. ` Mole fractionof a solute
`=("Numberof molesof solute" )/("Totalmolesin solution ")`
`:. X_("solute")=(2)/(56.56) = 0.0347`


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