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The freezing point depression constant for water is -1.86^ C m ⁻¹ . If 5.00 ~g Na SO ₄ is dissolved in 45.0 ~g H ₂ O , the freezing point is changed by -3.82^ C . Calculate the van't Hoff factor for Na ₂ SO ₄ .

Options

  1. A2.63
  2. B3.11
  3. C0.381
  4. D2.05

Correct answer

A. 2.63

Step-by-step solution

aligned T_f & =i K_f m or i & = T_f W_ solvent K_f n_ solute 1000 & = 3.82 45 1.86 ( 5 142 ) 1000 & =2.63 aligned

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