Question 9.63






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Samantha Man 1L
Posts: 63
Joined: Fri Sep 28, 2018 12:22 am

Question 9.63

Postby Samantha Man 1L » Fri Feb 22, 2019 12:09 am

"Determine which of the following compounds are stable with respect to decomposition into their elements under standard conditions at 25 &C (see Appendix 2A): (a) PCl5(g); (b) HCN(g); (c) NO(g); (d) SO2(g). " How do I determine stability based off of Gibbs free energy values?

Nicolette_Canlian_2L
Posts: 77
Joined: Fri Sep 28, 2018 12:25 am
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Re: Question 9.63

Postby Nicolette_Canlian_2L » Fri Feb 22, 2019 1:19 am

I'm having trouble with this one as well. What is the relationship between gibbs free energy and stability? Do we have to consider the other thermodynamic terms as well?

Kate_Santoso_4F
Posts: 72
Joined: Fri Sep 28, 2018 12:29 am

Re: Question 9.63

Postby Kate_Santoso_4F » Fri Feb 22, 2019 9:08 am

You can determine which of the following compounds are stable with respect to decomposition into their elements by analyzing their standard free energies of formation. Compounds with a positive free energy of formation are unstable with respect to the elements. Since PCl5 (g) and SO2 (g) have negative standard free energies of formation, they are thermodynamically stable.


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