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JAMB Chemistry 2022 Question 13

Question 13

Electrolysis

Calculate the number of moles of Cu(s) that will be deposited by 360 coulombs of electricity during the electrolysis of CuSO4(aq) using graphite electrodes.

  1. A.1.87×10−3 mole
  2. B.5.36×10−4 mole
  3. C.3.73×10−3 mole
  4. D.3.95×10−4 mole
Show the answer and explanation

Answer: A (1.87×10−3 mole)

Explanation

Cu2+ + 2e− → Cu, so 1 mole of Cu needs 2 × 96500 C. Moles = 360 ÷ 193000 = 1.87 × 10−3.