WAEC Chemistry 2011 Objective — Question 36

Question 36 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

What mass of copper would be formed when a current of 10.0A is passed through a solution of CuSO4 for 1 hour? [Cu=63.5; 1F=96500C]

A. A. 5.9 g
B. B. 11.8 gCorrect
C. C. 23.8 g
D. D. 47.3 g

Explanation

Q = It = 10 x 3600 = 36000 C. Cu²⁺+2e⁻→Cu(s) needs 2F (193000C) to deposit 1 mole (63.5g) of copper. Mass deposited by 36000C = (63.5/193000) x 36000 = 11.8 g.

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