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A 4% solution of non-volatile solute is ...

A 4% solution of non-volatile solute is isotonic with 0.702% urea solution Calculate the molar mass of the non-volatile solute. (Mola.r mass of urea = 60 g `mol^(-1)`)

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For isotonic solutions `(W_(1))/(M_(1)) = (W_(2))/(M_(2))`
`M_(2) = (W_(2)M_(1))/(W_(1)) = (40 xx 60)/(7.02) = 341.8`.
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