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

[neo2478]

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

$$\left[\frac{d\left(\frac{\Delta G}{T}\right)}{\delta T}\right]_p = \frac{\Delta H}{T^2}$$

 

[PhilippH]

humm ..looks like entropia. Or may be I'm completely wrong.

 

[neo2478]

So, you are saying that
$$\left[\frac{d\left(\frac{\Delta G}{T}\right)}{\delta T}\right]_p = \Delta S$$
?

 

[PhilippH]

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.

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

But wait a reply from someone that know of what is talking about because I'm not sure.

 

[hslilly]

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