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) (A) 3.5 (B)

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)

(A) 3.5
(B) 3.0
(C) 3.8
(D) 2.8

Prashant Kotian · Accepted Answer

Correct answer: B. Molality = solute M d M (Mw)     3 = x 1000 1.12 (x 40)     x = 3

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