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Question
How much electricity in terms of Faraday is required to produce 20 g of \[\ce{Ca}\] from molten \[\ce{CaCl2}\]?
(Given: Molar mass of Calcium is 40 g mol−1.)
Solution
\[\ce{CaCl2 -> Ca^{2+} + 2Cl-}\]
40 g of calcium needs = 2 mole of electrons
= 2 × 96500 coulombs
∴ 20 g of calcium needs = 96500 coulombs (1F)
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