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Chemistry · May / June 2025 · Paper 12 · Question 11

5070The mole and the Avogadro constant

The formula of hydrated sodium carbonate is Na₂CO₃•10H₂O. What is the percentage composition by mass of oxygen in hydrated sodium carbonate?

  1. A16.8
  2. B22.4
  3. C55.9
  4. D72.7

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Correct answer: D. 72.7

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