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Thermodynamic stability is determined by somethings Gº value. The lower its Gº, the more stable it is going to be. If it is a reactant in a reaction, then the lower its Gº, the less likely it is going to be a spontaneous reaction.
JD123456 wrote:Kinetic stability basically occurs when the reactants react really slowly. The slower the reaction occurs, the greater the kinetic stability. If you say, "This reaction is kinetically stable," then that implies that the reaction occurs very slowly.
Thermodynamic stability depends on whether or not the reaction is spontaneous. This depends on the change in free energy (ΔG). A thermodynamically stable reaction is one that basically does not react. As a result, it is independent of the pathway between reactants and products.
It's like the diamond example on page 52 of the course reader: The reaction of diamond turning into graphite has a negative ΔG, meaning that it is thermodynamically unstable and will spontaneously occur. However, it will take an extremely long time for this to happen, showing that it is kinetically stable and so kinetics is controlling this reaction rather than thermodynamics. Hope this helps!
When something has a lower delta G, it's in a lower energy form, and thus less likely to react. If it's prone to stay in the lowest energy form, or in reactants, you can tell that it's thermodynamically stable
505316964 wrote:For something to be thermodynamically stable, it has to be spontaneous right? Even though it will not react
I think for something to be thermodynamically stable, it is non spontaneous since it is unlikely to move to a higher energy on its own, making it stable thermodynamically. On the other hand, for something to be thermodynamically unstable, it has to be spontaneous.
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