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The observed molar mass determined for Na ₂ SO ₄ by freezing point depression method is 50.0 ~g / mol . The molecular weight of Na ₂ SO ₄ is 142 . What will be the degree of dissociation for Na ₂ SO ₄ in water?

Options

  1. A0.23
  2. B0.18
  3. C0.78
  4. D0.92

Correct answer

D. 0.92

Step-by-step solution

van't Hoff factor, aligned i & = ( Molar mass )_ calculated ( Molar mass )_ observed & = 142 50 =2.84 aligned Na ₂ SO ₄ is an electrolyte in water = i-1 n-1 = 2.84 3-1 =0.92

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