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The density of 3 M solution of sodium chloride is 1.252 ~g ~mL ⁻¹ . The molality of the solution will be : ( . molar mass, . NaCl =585 ~g ~mol ⁻¹ )

Options

  1. A260 ~m
  2. B2.18 ~m
  3. C2.79 ~m
  4. D3.00 ~m

Correct answer

C. 2.79 ~m

Step-by-step solution

The relation between molarity (M) and molality (m) is d= M ( 1 m + M ₂ 1000 ), M ₂= Mol. mass of solute On putting value 1.252=3 ( 1 m + 58.5 1000 ) on solving m=2.79

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