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  4. Calculate the molality of a solution obtained by dissolving 15.87 g ethyl alcohol ( C 2 H 5 OH ) in 168 g of H 2 O

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Q. Calculate the molality of a solution obtained by dissolving $15.87\, g$ ethyl alcohol $\left( C _{2} H _{5} OH \right)$ in $168 g$ of $H _{2} O$

Some Basic Concepts of Chemistry

Solution:

$m =\frac{ W _{2} \times 1000}{ M _{ w _{2}} \times W _{1}}=\frac{15.87 \times 1000}{46 \times 168}=2.05$