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JAMB Chemistry 2004 Question 3

Question 3

Mole Concept and Stoichiometry

If a solution contains 4.9g of tetraoxosulphate(VI) acid, calculate the amount of copper (II) oxide that will react with it. [Cu = 64, O = 16, S = 32, H = 1]

  1. A.0.8g
  2. B.4.0g
  3. C.40.0g
  4. D.80.0g
Show the answer and explanation

Answer: B (4.0g)

Explanation

H2SO4 + CuO → CuSO4 + H2O (1 : 1). 4.9 g ÷ 98 = 0.05 mol, so CuO needed = 0.05 × 80 = 4.0 g.