Concept24 - Concept 6.2 The free-energy change of a...

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Concept 6.2 The free-energy change of a reaction tells us whether the reaction occurs spontaneously How can we determine which reactions occur spontaneously and which ones require an  input of energy? The concept of free energy provides a useful function for measuring spontaneity of a system. Free energy  is the portion of a system’s energy that is able to perform work when  temperature and pressure is uniform throughout the system, as in a living cell. The free energy (G) in a system is related to the total enthalpy (in biological systems,  equivalent to energy) (H) and the entropy (S) by this relationship: G = H − TS, where T is temperature in Kelvin units. Increases in temperature amplify the entropy term. Not all the energy in a system is available for work because the entropy component must be  subtracted from the enthalpy component.
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Concept24 - Concept 6.2 The free-energy change of a...

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