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Cell Potential given Change in Gibbs Free Energy Calculator

Cell Potential Formula:

\[ E_{cell} = \frac{-\Delta G}{n \times F} \]

J

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1. What is Cell Potential given Change in Gibbs Free Energy?

Definition: This calculator determines the cell potential (Ecell) of an electrochemical cell based on the Gibbs free energy change (ΔG) and the moles of electrons transferred (n) in the redox reaction.

Purpose: It helps chemists and electrochemists relate thermodynamic quantities to electrochemical cell potentials.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ E_{cell} = \frac{-\Delta G}{n \times F} \]

Where:

Explanation: The negative Gibbs free energy change is divided by the product of moles of electrons and Faraday's constant to calculate the cell potential.

3. Importance of Cell Potential Calculation

Details: Cell potential indicates the driving force of an electrochemical reaction and determines whether a reaction will occur spontaneously (ΔG < 0, Ecell > 0).

4. Using the Calculator

Tips: Enter the Gibbs free energy change in joules and the moles of electrons transferred in the redox reaction. The moles of electrons must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does a positive cell potential indicate?
A: A positive Ecell indicates a spontaneous reaction (ΔG < 0), while negative indicates non-spontaneous.

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

Q3: What units should Gibbs free energy be in?
A: The calculator expects joules (J). If you have kJ, multiply by 1000 before entering.

Q4: Why is the Faraday constant used?
A: It converts between moles of electrons and total charge (1 mole e- = 96485 C).

Q5: Can this calculate standard cell potential?
A: Yes, if you use standard Gibbs free energy change (ΔG°).

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