Question 15
ElectrolysisCuSO4(aq) is electrolyzed using platinum electrodes with a current of 0.193 amperes for 2 hours. How many grams of copper are deposited at the cathode? [Cu= 63.5 F=96500 coulombs]
- A.0.500g
- B.0.457g
- C.0.914g
- D.1.000g
Show the answer and explanation
Answer: B (0.457g)
Explanation
Q = It = 0.193 × 7200 = 1389.6 C. Cu2+ needs 2 × 96500 C per mole, so mass = 1389.6/193000 × 63.5 ≈ 0.457 g.