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Topic: Calculation of Free Energy of Formations?  (Read 2426 times)

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Offline kev90123

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Calculation of Free Energy of Formations?
« on: September 30, 2013, 12:33:34 AM »
How are free energy of formation values calculated exactly? For example water has  has a  free energy of formation value of -237 kJ/mol. How is this energy being released actually being measured? Thanks in advance.
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Offline adianadiadi

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Re: Calculation of Free Energy of Formations?
« Reply #1 on: September 30, 2013, 11:08:19 AM »
Quote from: kev90123 on September 30, 2013, 12:33:34 AM
How are free energy of formation values calculated exactly? For example water has  has a  free energy of formation value of -237 kJ/mol. How is this energy being released actually being measured? Thanks in advance.

Free energy, I think a misnomer. It is not exactly energy though having energy units. It is -TdS(universe). It is related to enthalpy and entropy of the reaction i.e. dG = dH-TdS.
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Offline kev90123

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Re: Calculation of Free Energy of Formations?
« Reply #2 on: September 30, 2013, 01:20:50 PM »
Yes I know dG = dH-TdS but how are these values found experimentally? Or if they are not found experimentally how does one go about  determining free energy of formation values (that can be used to find the change in free energy of a chemical rxn?)
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