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  4. The molality of the solution prepared by dissolving 125 mL of pure methanol ( d =0.8 gmL -1) in 375 g of ethanol is:

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Q. The molality of the solution prepared by dissolving 125 $mL$ of pure methanol $\left( d =0.8 \,gmL ^{-1}\right)$ in $375 \,g$ of ethanol is:

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Solution:

$m =\frac{125 \times 0.8 \times 1000}{32 \times 375}=8.33$