Question

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

• A. $2.5m$
• B. $5m$
• C. $10m$
• D. $1.25m$

Answer 1

Answer: (A)

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