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Besides indicating spontaneity, the free energy change gives information about the amount of:

AUseful work available
BLight emitted overall
CSound produced overall
DColour change seen
Answer & Solution
Correct answer: A. Useful work available
1. Free energy carries two pieces of information at once. 2. The free energy change indicates spontaneity. 3. In addition, it provides information regarding the amount of useful work. 4. That work may be accomplished by a spontaneous process. _Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 16 'Thermodynamics', sections 16.1-16.4_
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