OnlineCBT
Chemistry · Some Basic Concepts of Chemistry
हिन्दीThe density of \( 3\text{ M} \) solution of sodium chloride is \( 1.25\text{ g mL}^{-1} \). The molality of the solution is:
Correct answer · Option 3
2.79 mol kg⁻¹
Explanation
Mass of \( 1\text{ L} \) solution = \( 1250\text{ g} \). Mass of \( \text{NaCl} = 3 \times 58.5 = 175.5\text{ g} \). Mass of solvent = \( 1250 - 175.5 = 1074.5\text{ g} = 1.0745\text{ kg} \). Molality = \( 3 / 1.0745 = 2.79\text{ mol kg}^{-1} \).
