Delta G

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Nathan Mariano 2G
Posts: 68
Joined: Fri Sep 28, 2018 12:29 am

Delta G

Postby Nathan Mariano 2G » Tue Feb 19, 2019 10:13 pm

Dr. Lavelle mentioned that a positive delta H (endothermic reaction) is, the more that it does not favor the forward process in the equation (delta g = delta h - temperature x delta s). Why does a positive delta H not favor the forward process? I thought that endothermic reactions do favor forward reactions.

Max Hayama 4K
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

Re: Delta G

Postby Max Hayama 4K » Tue Feb 19, 2019 10:16 pm

Normally a negative deltaH indicates spontaneity assuming that delta S is positive or that the temperature of the reaction is low. This will result in a negative deltaG value most of the time.

Fiona Jackson 1D
Posts: 30
Joined: Fri Sep 28, 2018 12:22 am

Re: Delta G

Postby Fiona Jackson 1D » Wed Feb 20, 2019 1:19 pm

Hi! Also, a positive delta H in the equation deltaG=deltaH-TdeltaS would make it so the entropy and temperature term would have to be positive and greater that the delta H, making it more likely for delta G to be positive, and thus make the reaction not spontaneous.

Hedi Zappacosta 1E
Posts: 66
Joined: Fri Sep 28, 2018 12:27 am

Re: Delta G

Postby Hedi Zappacosta 1E » Wed Feb 20, 2019 3:35 pm

A negative delta H means that it is exothermic, and usually exothermic processes are favored because they don't require extra energy

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