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JAMB Chemistry 1990 Question 4

Question 4

Mole Concept and Stoichiometry

The Avogadro number of 24 g of magnesium is the same as that of

  1. A.1g of hydrogen molecules
  2. B.16 g of oxygen molecules
  3. C.32 g of oxygen molecules
  4. D.35.5 g of chlorine molecules.
Show the answer and explanation

Answer: C (32 g of oxygen molecules)

Explanation

24 g of magnesium is 1 mole. 32 g of O2 is also 1 mole, so it has the same number of particles; the other masses are only half a mole of molecules.