2
$\begingroup$

I'm not too sure if I understand this correctly:
Is the $G_\mathrm{m}$, the Gibbs free energy of the entire system, divided by the amount of substance making up the system, while $\mu$ is the Gibbs free energy of a component of the system?

If so, what does ${\partial G_\mathrm{m}}/{\partial n}=\mu$ signify? As in, what's the difference between this and $\mathrm{d}G/\mathrm{d}n=\mu$?

$\endgroup$
  • $\begingroup$ @orthocresol Any particular reason you removed the subscripted unicode m? $\endgroup$ – Martin - マーチン May 27 '16 at 9:25
  • $\begingroup$ @Martin i.imgur.com/0GueIzJ.png $\endgroup$ – orthocresol May 27 '16 at 11:20
  • $\begingroup$ @orthocresol O.ô Guess you have some missing fonts then. Can you read any of the wikipedia page on unicode sub/superscript? (Also you just triggered a rollback war auto flag, lol.) $\endgroup$ – Martin - マーチン May 27 '16 at 11:32
  • $\begingroup$ @Martin oops, sorry! Well, about two-thirds of the symbols are fine, the others don't appear. The subscripted numbers work (so chemical formulae in titles tend to work) $\endgroup$ – orthocresol May 27 '16 at 14:23
  • 1
    $\begingroup$ You are thinking in the right direction, but it has no mathematical sense. Now there is a misunderstanding of derivatives :-) We can fix $T$ and $p$ in a system, but $\partial G / \partial T$ (or $p$) won't be null, because they represent how $G$ would change if in infinitesimal change in $T$ (or $p$) is performed. $\endgroup$ – user1420303 May 27 '16 at 15:54
3
$\begingroup$

The chemical potential of a species is the partial derivative of the Gibbs free energy of the mixture of components with respect to the number of moles of that particular species, holding the temperature, pressure, and number of moles of all the other species constant. For a single component system, this is reduces to the total free energy divided by the number of moles.

| improve this answer | |
$\endgroup$
  • $\begingroup$ I request that the answer be made more clear by giving an example of the difference between molar Gibbs Free Energy and Chemical Potential. $\endgroup$ – shre_sudh_97 Jun 26 '16 at 12:13
  • 2
    $\begingroup$ I don't know how I can say it any more clearly. The Chemical Potential is defined as the partial molar free energy. $\endgroup$ – Chet Miller Jun 26 '16 at 12:44

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.