Consider the cell at : . The fraction of total iron present as ion at the cell potential of 1.500 V is . The value of x is . (Nearest integer). Given: ,

Question

Consider the cell at : . The fraction of total iron present as  ion at the cell potential of 1.500 V is . The value of x is . (Nearest integer). Given: ,

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Strategy:
 Use the Nernst Equation for a redox mixed ion cell () combined with a Zinc electrode. Solve for the ratio and then the mole fraction.

Step 1: Calculate 
Cathode: . Anode: .

Net Reaction: , .

Step 2: Apply Nernst
. .

Step 3: Finding Fraction of 
Total Iron .
Fraction .

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