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Chemistry · May / June 2026 · Paper 11 · Question 11

5070The mole and the Avogadro constant

A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass. The relative molecular mass of the compound is between 55 and 65. What is the molecular formula of the compound?

  1. ACH2O
  2. BC2H4O
  3. CC2H4O2
  4. DC2H6O2

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Correct answer: C. C2H4O2

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