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Exercise 9.63

Posted: Sun Feb 04, 2018 8:32 pm
by Rucha Kulkarni 2A
Does anyone know how to solve exercise 9.63 on the homework?

Re: Exercise 9.63

Posted: Sun Feb 04, 2018 9:44 pm
by Anna Li 2E
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:
viewtopic.php?f=135&t=19252

Re: Exercise 9.63

Posted: Sun Feb 04, 2018 9:50 pm
by Nishma Chakraborty 1J
Hey!

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 :)