Calculate the electric current required to deposit 0.972 g of chromium in three hours. ECE of chromium is 0.00018 gC⁻¹.

JAMB Physics 2024 198 views
Source: JAMB · 2024

Calculate the electric current required to deposit 0.972 g of chromium in three hours. ECE of chromium is 0.00018 gC⁻¹.

  1. 0.75 A
  2. 0.50 A ✓
  3. 0.83 A
  4. 0.17 A
Explanation

Faraday’s first law: mass deposited = ECE × charge, m = zQ.

Charge Q = m ÷ z = 0.972 ÷ 0.00018 = 5400 C.

Time = 3 hours = 3 × 3600 = 10,800 s.

Current I = Q ÷ t = 5400 ÷ 10,800 = 0.50 A.

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