What mass of copper will be produced from 0.5 Faraday of electricity [Cu=63.5].

What mass of copper will be produced from 0.5 Faraday of electricity [Cu=63.5].

A. 63.5g

B. 31.75g

C. 15.88g

D. 7.95g

Apply Faraday’s first law of electrolysis.

Step 1: Write the electrode reaction

Cu^2+ + 2e^- 一> Cu

• 1 mole of Cu²⁺ requires 2 Faradays to be discharged.

• Therefore, 1 Faraday deposits half a mole of Cu.

Step 2: Determine mass deposited by 1 Faraday

Mass by 1 F = Atomic mass/valency = 63.5/2 = 31.75 g

Step 3: Find mass deposited by 0.5 Faraday

Mass = 0.5 * 31.75 = 15.875 approx 15.88 g

✅ Correct answer: C. 15.88 g

Exam tip (WAEC/NECO):
Mass deposited = F * Atomic mass/valency

PQN: 34