Energetics & electrochemistry · HL
Electrochemistry E°cell & ΔG° Calculator (HL)
HL tool. Enter both electrode values as standard reduction potentials in volts.
Your values
Start with the example or enter your own values. Use a dot for decimals and e for scientific notation.
Calculated locally. No account or input upload.
Result & working
ExampleThe calculator is loading. The worked example is also shown below.
Step-by-step working
The formula
E°cell = E°cathode − E°anode
ΔG° = −nFE°cell
| Symbol | Meaning |
|---|---|
| F | Faraday constant ≈ 96485 C mol⁻¹. |
| n | Moles of electrons transferred per stoichiometric reaction. |
When to use this calculator
A positive E°cell gives negative ΔG° for the reaction written under standard conditions. Multiplying a half-equation does not multiply its electrode potential.
Worked example
The page opens with these example values. The result below is pre-generated for reference.
- E°cell = E°cathode − E°anode = 0.34 − (-0.76) = 1.1 V
- ΔG° = −nFE° = −2 × 96485.33 × 1.1 = -212.2677 kJ mol⁻¹
1.1 V
Common mistakes
- Use reduction potentials consistently.
- n is the electron-transfer stoichiometry, not the coefficient of an arbitrary species.