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Chemistry · May / June 2021 · Paper 12 · Question 10

5070The mole and the Avogadro constant

The names and formulae of three nitrogen compounds are shown. ammonia hydrazine hydroxylamine NH3 N2H4 NH2OH Which compound has the highest relative molecular mass, Mr, and in which compound is the percentage by mass of hydrogen the greatest?

  1. Ahighest Mr: N2H4; greatest percentage by mass of hydrogen: NH3
  2. Bhighest Mr: N2H4; greatest percentage by mass of hydrogen: N2H4
  3. Chighest Mr: NH2OH; greatest percentage by mass of hydrogen: NH3
  4. Dhighest Mr: NH2OH; greatest percentage by mass of hydrogen: N2H4

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Correct answer: C. highest Mr: NH2OH; greatest percentage by mass of hydrogen: NH3

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