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  4. Molarity and molality of a solution of caustic soda are respectively 11.12 M and 94.12 m. The density of the solution is

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Q. Molarity and molality of a solution of caustic soda are respectively 11.12 M and 94.12 m. The density of the solution is

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Solution:

$d=M \left(\frac{1}{m}+\frac{\text{molar mass of solute}}{1000}\right)$
$d=11.12\left(\frac{1}{94.12}+\frac{40}{1000}\right)$
$=0.556\,g\,ml^{-1}$