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Chemistry · May / June 2021 · Paper 11 · Question 11

5070The mole and the Avogadro constant

The relative formula masses of four compounds are given. A student has a 1.0 g sample of each compound. Which sample contains the highest number of moles of oxygen atoms?

  1. AAl2O3 (relative formula mass 102)
  2. BCuO (relative formula mass 80)
  3. CH2SO4 (relative formula mass 98)
  4. DHNO3 (relative formula mass 63)

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Correct answer: D. HNO3 (relative formula mass 63)

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