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Topic: Chemical potential  (Read 2039 times)

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Offline noor123

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Chemical potential
« on: January 13, 2015, 02:30:28 PM »
Can someone please define and describe the applications of the chemical potential of a substance?

I know the definition which is that the chemical potential of a substance is the partial molar Gibbs energy of that substance in a mixture.
But not sure about the applications...


Offline Plontaj

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Re: Chemical potential
« Reply #1 on: January 13, 2015, 02:55:48 PM »
Standard change free Gibbs energy of reaction determine constant of reaction K and therefore direction of reaction.
K=exp(-ΔoGr/RT)

ΔGr=ΔoGr+zi*RT*ln(pi) eg. in gas-phase reaction
ΔGr=0 - equilibrium
ΔGr>0 - reaction is thermodynamically limited
ΔGr<0 - reaction can go (in right) if there aren't any others limits (like kinetic or diffusion)


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