JEE Main 2024 Chemistry question
The density of 'x' M solution ('x' molar) of NaOH is 1.12 g mL⁻¹, while in molality, the concentration of the solution is 3 m (3 molal). Then x is (Given: Molar mass of NaOH is 40 g/mol)
Answer: (B)
Solution
3 m: 3 mol (120 g) per 1000 g water, so the solution weighs 1120 g and has volume 1120/1.12 = 1000 mL; the molarity is 3 M.