Question

Write balanced half-reactions for the following redox reaction:

2CO2(g)+9H2O(l)+12Fe+2(aq)→ C2H5OH(l)+12OH−(aq)+12Fe+3(aq)

Answer 1

2CO₂(g)+9H₂O(l)+12Fe⁺²(aq)→ C₂H₅OH(l)+12OH⁻(aq)+12Fe⁺³(aq)for writing half cell reactions first we have to write unbalanced half cell reactions in oxidation and reduction

Oxidation Fe²⁺ → Fe³⁺

Reduction 2CO₂ → C₂H₅OH

now balance oxygen atoms to the both sides and then balance hydrogen with adding OH^- and H₂O

Oxidation Fe²⁺ → Fe³⁺

Reduction  2CO₂ + 12H₂O → C₂H₅OH + 3H₂O + 12OH^-

balance the charge to the both sides by electrons

Oxidation Fe²⁺ → Fe³⁺+ e^-

Reduction  2CO₂ + 12H₂O + 12e^- → C₂H₅OH + 3H₂O + 12OH^-

balance the electrons factor to the both sides

Oxidation 12Fe²⁺(aq) → 12Fe³⁺(aq) + 12e^-

Reduction 2CO₂(g) + 9H₂O(l) + 12e^- → C₂H₅OH(l) + 12OH^-(aq)

the above underline equations are balanced half cell reactions

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