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Questions
How much electricity in terms of Faraday is required to produce 20 g of Ca from molten CaCl2?
(Given: Molar mass of Calcium is 40 g mol−1.)
How much electricity in terms of Faraday is required to produce 20.0 g of Ca from molten CaCl2?
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Solution 1
\[\ce{CaCl2 -> Ca^{2+} + 2Cl-}\]
40 g of calcium needs = 2 mole of electrons
= 2 × 96500 coulombs
∴ 20 g of calcium needs = 96500 coulombs (1F)
Solution 2
\[\ce{CaCl2 -> Ca}\]
\[\ce{\underset{1 mole}{Ca^{2+}} + \underset{2 moles}{2e-} -> \underset{1 mole}{Ca}}\]
40 g of calcium requires = 2 F
∴ 20 g of calcium requires 1 F.
Notes
Students should refer to the answer according to their questions.
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