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STANDARD Chemistry Molality MCQ Question

Type: MCQ-numerical-Medium-Class 12

The density of 2M aqueous solution of NaOH is 1.28 g/cm³. The molality of the solution is [Given that molecular mass of NaOH = 40 g mol⁻¹]

A

1.20 m

B

1.56 m

C

1.67 m

D

1.32 m

Correct Answer

Option C

Detailed Explanation

Density = 1.28 g/cc, Concentration of solution = 2 M. Molar mass of NaOH = 40 g mol⁻¹. Mass of solute = 80 g, Mass of solvent = 1200 g. Molality = (80/40) / (1200/1000) = 1.67 m.

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