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KCET2011ChemistrySolutions

The empirical formula of a non-electrolyte is CH ₂ O . A solution containing 3 ~g of the compound exerts the same osmotic pressure as that of 0.05 M glucose solution. The molecular formula of the compound is

Options

  1. ACH ₂ O
  2. BC ₂ H ₄ O ₂
  3. CC ₄ H ₈ O ₄
  4. DC ₃ H ₆ O ₃

Correct answer

B. C ₂ H ₄ O ₂

Step-by-step solution

For isotonic solution (solution with same osmotic pressure) C₁=C₂ gathered W_ x M_ X = W_ C ₆ H ₁₂ O ₆ M_ C ₆ H ₁₂ O ₆ 3 M_ x = 9 180 0.05 M C ₆ H ₁₂ O ₆ containing 9 ~g of glucose M_ x = 3 180 9 =60 gathered Molecular weight of a non-electrolyte is 60 Molecular formula =n empirical formula Empirical formula = CH ₂ O Empirical formula mass =12+2+16=30 aligned n &= molecular mass empirical formula mass &= 60 30 =2 aligned Molecular formula =2 CH ₂ O = C ₂ H ₄ O ₂

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