AP Chemistry : Cell Potential and Free Energy

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #91 : Thermodynamics




What is ? Is reaction 3 spontaneous?

Possible Answers:

, spontaneous

, nonspontaneous

, nonspontaneous

, spontaneous

Correct answer:

, nonspontaneous


There are two concepts to consider in this problem.  First, the question asks for the .  Reaction 3 has  being reduced so the potential for the half reaction becomes negative.  half reaction appears the same in reaction 3 so the potential is the same. Second, negative voltages indicate non-spontaneity and positive voltages are spontaneous.  

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