MCAT General Chemistry Question 170: Answer and Explanation
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Question: 170
5. If the value of E°cell is known, what other data is needed to calculate ΔG°?
- A. Equilibrium constant
- B. Reaction quotient
- C. Temperature of the system
- D. Half-reactions of the cells
Correct Answer: D
Explanation:
This answer comes directly from the equation relating Gibbs free energy and E°cell. ΔG° = -nFE°cell, where n is the number of moles of electrons transferred and F is the Faraday constant, 
To determine n, one must look at the balanced half-reactions occurring in the oxidation-reduction reaction.