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Chemistry · Oct / Nov 2022 · Paper 11 · Question 14

5070The mole and the Avogadro constant

The atomic number of ruthenium is 44. One of the oxides of ruthenium is a black solid, X. 5.79 g of X contains 1.39 g of oxygen. What is the empirical formula of X?

  1. ARu2O
  2. BRuO
  3. CRuO2
  4. DRuO4

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Correct answer: C. RuO2

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