The density of a solution of is . The molality of the solution is: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
The density of a $2.0 \text{ M}$ solution of $NaNO_3$ is $1.25 \text{ g/mL}$. The molality of the solution is:
Answer: A
💡 Solution & Explanation
$\text{Mass of 1L} = 1250 \text{ g}$. $\text{Solute} = 2 \times 85 = 170 \text{ g}$. $\text{Solvent} = 1250 - 170 = 1080 \text{ g} = 1.08 \text{ kg}$. $\text{Molality} = 2 / 1.08 \approx 1.85 \text{ m}$.
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