1 F is equivalent to the charge on 1 mol of electrons - VCE - SSCE Chemistry - Question 20 - 2021 - Paper 1
Question 20
1 F is equivalent to the charge on 1 mol of electrons.
The mass of nickel, Ni, that can be electroplated onto the platinum, Pt, electrode with 320 F of charge is
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Worked Solution & Example Answer:1 F is equivalent to the charge on 1 mol of electrons - VCE - SSCE Chemistry - Question 20 - 2021 - Paper 1
Step 1
Calculate the total charge in coulombs
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Answer
Given that 1 F is equivalent to the charge on 1 mol of electrons, we can calculate:
[ Q = n \times F ]
where ( Q ) is the total charge in coulombs, ( n ) is the number of moles of electrons, and ( F ) is Faraday's constant, approximately 96500 C/mol. In this case, we have:
[ Q = 320 , F = 320 , C ]
Step 2
Determine the moles of nickel deposited
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Answer
Using the relation:
[ n = \frac{Q}{F} ]
The electroplating of nickel (Ni) requires the following reaction:
[ \text{Ni}^{2+} + 2e^{-} \rightarrow \text{Ni} ]
This shows that 2 moles of electrons are needed to deposit 1 mole of Ni. Therefore:
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Answer
Based on the calculations, the nearest correct value for the mass of nickel that can be electroplated is approximately 9.73 × 10² g. Therefore, the correct answer is:
