WAEC Chemistry 2014 Theory — Question 11
Question 11 of 38 from the West African Examinations Council (WAEC) Chemistry 2014 Theory paper, with the correct answer and a full explanation.
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1(j). Calculate the amount of silver deposited in moles when 10920 coulombs of electricity is passed through a solution of a silver salt. [Faraday constant = 96500Cmol⁻¹]
Model answer
Ag⁺+e⁻→Ag(s). Since 1 mole of Ag takes 1 mole of electrons, 1F = 96500C is required to deposit 1 mole of Ag. If 10920C of electricity is used, mole of Ag produced = 10920/96500 = 0.1132 mole.
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