If of NaOH is completely dissolved to prepare exactly of an aqueous solution, what is the molarity o — Solutions and Colligative Properties Chemistry Question
Question
If $0.4\text{ g}$ of NaOH is completely dissolved to prepare exactly $40\text{ mL}$ of an aqueous solution, what is the molarity of the resulting solution? (Molar mass of NaOH = $40\text{ g/mol}$)
Answer: B
💡 Solution & Explanation
Molarity ($M$) = $\frac{\text{Mass of solute}}{\text{Molar Mass}} \times \frac{1000}{\text{Volume in mL}}$. Here, $M = \frac{0.4}{40} \times \frac{1000}{40} = 0.01 \times 25 = 0.25\text{ M}$.
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