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What is the Gibbs Free Energy? Is Gibbs Free Energy a state function the system? Why...

What is the Gibbs Free Energy? Is Gibbs Free Energy a state function the system? Why is the Gibbs Free energy of a substance or the change in Gibbs Free Energy in a chemical reaction an important consideration?
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Gibbs free energy is the free energy to carry out maximum amount of work by a thermodynamic system at constant temperature and pressure.

It is a state function as it is defined in terms of thermodyamic properties like temperature and pressure which are state functions.

It is important to consider the value of Gibbs free energy for a reaction because it determines that whether the reaction is spontaneous or not. If the value of Gibbs energy is negative , then the reaction is spontaneous and if it is positive then the reaction is non-spontaneous.

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