1. What is Standard Change in Gibbs Free Energy?

Definition: The Standard Gibbs Free Energy is a thermodynamic potential that measures the maximum reversible work that may be performed by a thermodynamic system at constant temperature and pressure.

Purpose: It helps predict the spontaneity of electrochemical reactions and the maximum work obtainable from them.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \Delta G° \) — Standard Gibbs Free Energy (Joules)
• \( n \) — Moles of electrons transferred in the reaction
• \( F \) — Faraday constant (96485.33212 C/mol)
• \( E°_{cell} \) — Standard cell potential (Volts)

Explanation: The negative sign indicates that a positive cell potential corresponds to a spontaneous reaction (negative ΔG°).

3. Importance of Gibbs Free Energy Calculation

Details: Calculating ΔG° helps determine whether an electrochemical reaction will occur spontaneously under standard conditions.

4. Using the Calculator

Tips: Enter the moles of electrons transferred in the redox reaction and the standard cell potential. Both values are required.

5. Frequently Asked Questions (FAQ)

Q1: What does a negative ΔG° value mean?
A: A negative ΔG° indicates the reaction is spontaneous under standard conditions.

Q2: How do I find the moles of electrons transferred?
A: Balance the redox reaction to determine the number of electrons transferred.

Q3: What units does this calculator use?
A: The result is in Joules (J). For kJ, divide the result by 1000.

Q4: Can I use this for non-standard conditions?
A: No, this calculates standard ΔG° only. For non-standard conditions, use the Nernst equation.

Q5: What's the relationship between ΔG° and cell potential?
A: They are directly related - more positive cell potentials give more negative ΔG° values (more spontaneous reactions).