What are enthalpy, Gibbs free energy and Helmholtz free energy used for?

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abi.ayan
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To analyze what does the enthalpy, gibbs free energy and helmholtz free energy are used?What is actually meant by usable energy?
 
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Hello abi. I looked at a few earlier threads from you to place this question in a context. Did not succeed, so I have to ask you: Could you tell us a bit more so we may hopefully provide you with better assistance ?
 

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