EMF of a cell
EMF of a cell
Formula
ΔG° = −nFE°
Real World
Duracell alkaline batteries are designed so the Zn/MnO₂ cell has a positive E°cell (~1.5 V), confirming the redox reaction is spontaneous and will release energy to power a device.
Exam Focus
Substitute values into ΔG° = −nFE° to confirm spontaneity; positive E°cell must give negative ΔG° — check sign consistency.
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