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Question

The quantity of electricity required to deposit 1.15 g of sodium from molten NaCl (Na = 23, Cl = 35.5) is :

A
1 F
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B
0.5 F
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C
0.05 F
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D
1.5 F
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Solution

The correct option is B 0.05 F
Mass of Na is divided with its atomic mass to obtain number of moles.
Number of moles of Na =1.1523=0.05 moles.
Na++eNa
Thus, deposition of 1 mole of Na will require 1 mole of electrons which corresponds to 1 Faraday of electricity. The, deposition of 0.05 moles (1.15 g) of Na will require 0.05 moles of electrons which corresponds to 0.05 Faraday of electricity.

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