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Delta G is defined as the amount of energy available to do useful work (ie non expansion work) for a spontaneous process under a constant temperature and pressure. Therefore, by definition delta G equals the maximum possible work that the system can do. A proof for this exists that involves some differential calculus if you're interested.
Last edited by Sean_Rodriguez_1J on Thu Feb 21, 2019 9:30 pm, edited 2 times in total.
Remember that dG represents all the energy (from a process) that is free to do work. Essentially, this statement is saying that virtually all of the free energy calculated from the Gibbs Free Energy equation is available to do work (the maximum amount)
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