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Chemistry · May / June 2022 · Paper 11 · Question 14

5070The mole and the Avogadro constant

The relative molecular mass, Mr, of liquid Z is 60. Z contains 40.0% carbon, 6.70% hydrogen and 53.3% oxygen. Which row shows the correct empirical and molecular formulae of Z?

  1. Aempirical formula CH2O, molecular formula CH2O
  2. Bempirical formula CH2O, molecular formula C2H4O2
  3. Cempirical formula C2H4O2, molecular formula C2H4O2
  4. Dempirical formula CH3O, molecular formula C2H6O2

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Correct answer: B. empirical formula CH2O, molecular formula C2H4O2

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