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  4. What will be the molality of the solution made by dissolving 10 g of NaOH in 100 g of water?

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Q. What will be the molality of the solution made by dissolving $10\, g$ of $NaOH$ in $100 \,g$ of water?

Some Basic Concepts of Chemistry

Solution:

Molality $=\frac{\text{Wt. of solute}}{\text{Mol.wt.of solute}} \times \frac{1000}{\text{Wt. of solvent}}$
$ m = \frac{10}{40} \times \frac{1000}{100} = 2.5 \,m$