Molality (m) of 3 M aqueous solution of NaCl is: (Given : Density of solution = 1.25 g mL–1, Molar mass in g mol–1 : Na-23, Cl-35.5) (A) 2.90 m (B) 2.79 m (C) 1.90 m (D) 3.85 m

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Question

Molality (m) of 3 M aqueous solution of NaCl is: (Given : Density of solution = 1.25 g mL–1, Molar mass in g mol–1 : Na-23, Cl-35.5)

(A) 2.90 m
(B) 2.79 m
(C) 1.90 m
(D) 3.85 m

Prashant Kotian · Accepted Answer

Correct answer: B. 3 moles are present in 1 litre solution molality = 3 1000 1.25 1000 [3 58.5]     = 2.79 m

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