Exercise 9.63

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Rucha Kulkarni 2A
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Joined: Fri Sep 29, 2017 7:05 am

Exercise 9.63

Postby Rucha Kulkarni 2A » Sun Feb 04, 2018 8:32 pm

Does anyone know how to solve exercise 9.63 on the homework?

Anna Li 2E
Posts: 21
Joined: Sat Jul 22, 2017 3:00 am

Re: Exercise 9.63

Postby Anna Li 2E » Sun Feb 04, 2018 9:44 pm

I'm guessing you use Appendix A to check each molecule's gibb's free energy to see which ones have a positive free energy. Positive free energy corresponds with unstable molecules.

This topic was also answered by Chem_Mod at this thread if you are still confused:

Nishma Chakraborty 1J
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

Re: Exercise 9.63

Postby Nishma Chakraborty 1J » Sun Feb 04, 2018 9:50 pm


So, the question is asking which of the four compounds are stable compared to their individual elements. If a value of free energy is positive, that means that the compound is unstable with regards to its individual elements. Basically, that reaction is endothermic-- you have to put in heat/energy to bring the elements together. So, compounds with a negative value of free energy indicate that the reaction is favorable, and the elements want to form a bond in order to become more stable, and will release energy.

a) PCl5 and d)SO2 are the answer because they have negative delta G values.

Hope this helps :)

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