6th ed 9.65 stability

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Celine Cheng 1H
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6th ed 9.65 stability

Postby Celine Cheng 1H » Thu Feb 21, 2019 1:55 am

Since we're trying to see which compound is less stable with respect to their elements as the temperature is raised, we would want to see which one has a negative delta S (because that would result in delta G being positive, formation of compound is unfavorable compared to elements)

I had manipulated the Gibbs Free Energy Eqn to
delta S = delta H - delta G (I cancelled out T because it would be the same in all cases)
and I used the enthalpy of formation and gibbs free energy of formation from Appendix 2A

Would this method also work compared to the solutions manual, which calculates delta S using the molar entropies of the reactants and products? Or is that that because it is with respect to their elements, the latter method must be used?

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Re: 6th ed 9.65 stability

Postby Chem_Mod » Thu Feb 21, 2019 4:59 pm

can be used to find the sign of (since T is always positive in this class) instead of using the molar entropies of reactants and products.

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