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Chemistry · Oct / Nov 2024 · Paper 11 · Question 10

5070The mole and the Avogadro constant

Compound X contains carbon, hydrogen and oxygen only. It has an M_r of 90. 100 g of compound X contains 40.0 g of carbon and 6.7 g of hydrogen. How many oxygen atoms are there in each molecule of compound X?

  1. A1
  2. B2
  3. C3
  4. D4

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Correct answer: C. 3

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