The Change in Free Energy for a Reaction, G

question 28

Multiple Choice

The change in free energy for a reaction, G, depends on the stoichiometric coefficients used in writing the reaction, but cell potentials, E, do not depend on these coefficients. Which statement accounts for this difference?

• A) These quantities (  G and E) are not related, so this difference is not an issue.
• B) The free-energy change is defined for general reactions, and the electromotive force is defined for electrochemical reactions, so this difference is not an issue.
• C) The difference is not relevant because the units differ: kJ/mol for  G, and V for E.
• D) The change in free energy depends on both the reaction and the amount of material reacting, while the cell potential only depends on the cell composition.
• E) The statement is false.  G does not depend on the stoichiometric coefficients.

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