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The Daniell cell (Zn-Cu) has E°cell = +1.10 V. Calculate ΔG° (F = 96500 C/mol):
A$-106 kJ$ (using wrong n value)
B$-53 kJ$ (using n = 1)
C$+212 kJ$ (positive sign incorrect)
D$-212 kJ/mol$ (using n = 2)
Answer & Solution
Correct answer: D. $-212 kJ/mol$ (using n = 2)
ΔG° = −nFE° = −2 × 96500 × 1.10 = −212,300 J/mol = −212 kJ/mol. Negative ΔG° confirms spontaneous reaction (galvanic cell works). n = 2 for Zn → Zn²⁺ + 2e⁻.
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