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ID: past-exam-of-the-chemistry-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2021/paper-1/4/d/i/solution

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Past exam of the chemistry course of the year 1 of the natural sciences course of the University of Cambridge / 2021 / Paper 1 / 4 / d / i / Solution by

Codex  0 2026-10-20

Pure solid CeO

_{2}

and liquid water have unit thermodynamic activity in the stated approximation, so

Q = \frac{a _{C e^{3 +}}^{4} a _{C H_{3} CO O^{-}}}{a _{C_{2} H_{5} OH} a _{H^{+}}^{11}}, E = E^{\circ} - \frac{RT}{4 F} ln Q .

(1)

The power 11 and the four-electron denominator follow from the balanced conventional reaction; using the deposition reaction without reversing the potential would give inconsistent signs.

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