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JAMB Chemistry 2012 Question 25

Question 25

Electrolysis

What number of moles of Cu2+ will be deposited by 360 coulombs of electricity? [F = 96500 C mol−1]

  1. A.5.36 × 10−4 mole
  2. B.1.87 × 10−3 mole
  3. C.9.35 × 10−4 mole
  4. D.3.73 × 10−3 mole
Show the answer and explanation

Answer: B (1.87 × 10−3 mole)

Explanation

Cu2+ needs 2 F per mole: 360/(2 × 96 500) = 1.87 × 10−3 mole.