Standard Gibbs Free Energy Formula:
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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.
The calculator uses the formula:
Where:
Explanation: The negative sign indicates that a positive cell potential corresponds to a spontaneous reaction (negative ΔG°).
Details: Calculating ΔG° helps determine whether an electrochemical reaction will occur spontaneously under standard conditions.
Tips: Enter the moles of electrons transferred in the redox reaction and the standard cell potential. Both values are required.
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).