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( Spontaneous reaction)
A spontaneous process is a chemical reaction in which a system releases free energy (most often as heat) and moves to a lower, more thermodynamically stable, energy state.[1][2] The sign convention of changes in free energy follows the general convention for thermodynamic measurements, in which a release of free energy from the system corresponds to a negative change in free energy, but a positive change for the surroundings. For a reaction at constant temperature and pressure, the Gibbs free energy is a negative ?G would depend on the sign of the changes in enthalpy (?H), entropy (?S), and the magnitude of the absolute temperature (in kelvins). Changes in the sign of ?G cannot be changed directly by temperature, because it can never be less than zero. When ?S is positive and ?H is negative, a process is spontaneous
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