Positive delta G and spontaneous?

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mutant
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Positive delta G and spontaneous?

Post by mutant » Mon Oct 31, 2005 4:34 am

I know that negative delta G results in a spontaneous reaction but how does a reaction occur spontaneously with a postive delta G?

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zami'87.
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Re: Positive delta G and spontaneous?

Post by zami'87. » Mon Oct 31, 2005 6:27 am

mutant wrote:I know that negative delta G results in a spontaneous reaction but how does a reaction occur spontaneously with a postive delta G?

Ehh...only when g is negative.. G is free energy:
deltaG=deltaH-TdeltaS
H enthalpy-heat
S-enthropy-how much disordered is system
T-temperature
From equation u see that if heat is released(negative H) and system gets disordered(S is positive) then G is negative on anyT.
If H is positive(heat is absorbed but S is so positive then G is still negative and reaction is spontanous. If S is negative(system gets ordered but H is so negative G could be negative and reaction spontaneous)
Cheers!
Zami'87.

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