JAMB Chemistry 2012 Objective — Question 25

Question 25 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

What number of moles of Cu²⁺ will be deposited by 360 coulombs of electricity? [F=96,500C]

A. 5.36×10⁻⁴ mole
B. 1.87×10⁻³ moleCorrect
C. 9.35×10⁻³ mole
D. 3.73×10⁻³ mole

Explanation

1 mole of Cu²⁺ requires 2F (96,500C×2). Thus, 360C will only produce (1/(2×96,500))×360 mole = 1.87×10⁻³ mole.

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