How Does the Gibbs-Helmholtz Equation Relate to Calculating Enthalpy?

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Discussion Overview

The discussion revolves around the Gibbs-Helmholtz equation and its relationship to calculating enthalpy (\Delta H). Participants explore the implications of the equation in thermodynamics and its connection to entropy and free energy.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant seeks clarification on the physical representation of the Gibbs-Helmholtz equation and how to derive \Delta H from it.
  • Another participant suggests a connection to entropy, though they express uncertainty about their assertion.
  • A different participant questions whether the derivative of \Delta G with respect to temperature at constant pressure is equal to \Delta S, indicating a potential misunderstanding.
  • One participant corrects the previous statement, clarifying that the derivative relates to entropy but admits uncertainty about the broader context of the Gibbs-Helmholtz equation.
  • Another participant provides a method for obtaining enthalpy from the Gibbs-Helmholtz equation, suggesting that a plot of \Delta G/T versus 1/T could be useful.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and uncertainty regarding the Gibbs-Helmholtz equation and its implications. No consensus is reached on the interpretations or applications discussed.

Contextual Notes

Some statements reflect uncertainty about the relationships between the variables involved, and there are unresolved aspects regarding the derivation of enthalpy from the Gibbs-Helmholtz equation.

neo2478
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Can somebody please shed a little light on what this formula represents in the physical world?
And how could I solve it to get [tex]\Delta H[/tex]?

[tex] \left[\frac{d\left(\frac{\Delta G}{T}\right)}{\delta T}\right]_p = \frac{\Delta H}{T^2}[/tex]
 
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humm ..looks like entropia. Or may be I'm completely wrong.
 
So, you are saying that
[tex] \left[\frac{d\left(\frac{\Delta G}{T}\right)}{\delta T}\right]_p = \Delta S[/tex]
?
 
Last edited:
no i wrote that, but I'm not saying that :-).
Anyway should be something about Gibbs-Helmholtz equation, but i don't remeber much about it.
So something about chemistry and termodinamics application usually.

[tex] <br /> \left[\frac{\partial \Delta G}{\partial T}\right]_p = -\Delta S<br /> [/tex]

But wait a reply from someone that know of what is talking about because I'm not sure.
 
Gibbs Helmholtz
Note d(1/T)/dT is 1/T2. Solve for H. Cancel terms.
So Enthalpy can be obtained from plot of deltaG/T vs 1/T
 

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