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JAMB Chemistry 2009 Question 3

Question 3

Mole Concept and Stoichiometry

The percentage of water of crystallization in ZnSO4.7H2O is [Zn = 65, S = 32, O = 16, H = 1]

  1. A.33%
  2. B.44%
  3. C.55%
  4. D.87%
Show the answer and explanation

Answer: B (44%)

Explanation

Molar mass = 65 + 32 + 64 + 7(18) = 287. Water = 126, so 126/287 × 100 ≈ 44%.