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Chemistry · May / June 2019 · Paper 12 · Question 23

5070The mole and the Avogadro constant

The nitrogenous fertiliser urea has the structure shown. [structure: H2N-CO-NH2] Which percentage, by mass, of nitrogen does it contain?

  1. A23.3
  2. B25.0
  3. C43.8
  4. D46.7

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Correct answer: D. 46.7

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