The quantity of electricity in Faraday needed to reduce 1 mol of to is

Question

The quantity of electricity in Faraday needed to reduce 1 mol of  to  is

Canvas Classes · Accepted Answer

Strategy:
 Identify the change in oxidation number for chromium in the dichromate reduction half-reaction. The total change for 1 mole of the compound gives the result in Faraday ().

Step 1: Write the reduction half-reaction

Step 2: Determine electrons transferred
- Oxidation state of Cr in  is .
- Oxidation state of Cr in product is .
- Change per Cr atom .
- Since there are 2 Cr atoms per molecule, total electrons per mole of dichromate .

Step 3: Conversion
Charge .

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