September 16, 2024, 04:24:18 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Calculation of Free Energy of Formations?  (Read 2310 times)

0 Members and 1 Guest are viewing this topic.

Offline kev90123

  • New Member
  • **
  • Posts: 3
  • Mole Snacks: +0/-0
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.
Logged

Offline adianadiadi

  • Regular Member
  • ***
  • Posts: 51
  • Mole Snacks: +0/-6
    • AdiChemistry: An Online Resource of Chemistry Study Material
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.
Logged

Offline kev90123

  • New Member
  • **
  • Posts: 3
  • Mole Snacks: +0/-0
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?)
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links