Relation to Enthalpy and Entropy


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charlotte_jacobs_4I
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Joined: Fri Sep 28, 2018 12:29 am

Relation to Enthalpy and Entropy

Postby charlotte_jacobs_4I » Sun Feb 24, 2019 5:10 pm

How are Gibb's Free Energy, Work, Enthalpy and Entropy related?? is this significant?

Edward Xie 2E
Posts: 63
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Re: Relation to Enthalpy and Entropy

Postby Edward Xie 2E » Sun Feb 24, 2019 5:36 pm

ΔG°RXN = ΔH°RXN - TΔS°RXN
G is Gibb's free energy, H is enthalpy, S is entropy. Enthalpy and work are related through the equation ΔU = qP + w = ΔH - PΔV.
It's significant in that a negative ΔG means that the reaction is spontaneous, and the sign of ΔG will depend on the values of ΔH and TΔS.

Ethan Yi 1K
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Joined: Fri Sep 28, 2018 12:28 am

Re: Relation to Enthalpy and Entropy

Postby Ethan Yi 1K » Sun Feb 24, 2019 6:04 pm

these are all related through different equations that are given to us. they are all significant in their own way, as G tells us about spontaneity, and H tells us about endothermic/exothermic.

Jonas Talandis
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Joined: Fri Sep 28, 2018 12:16 am

Re: Relation to Enthalpy and Entropy

Postby Jonas Talandis » Sun Feb 24, 2019 6:50 pm

You can calculate all of these values in the equation in one of the replies above in order to make extrapolations about whether the reaction will be spontaneous, whether its exothermic or endothermic, etc. These qualities tell us a lot about the reaction past just the quantified values of these terms.

yuetao4k
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Re: Relation to Enthalpy and Entropy

Postby yuetao4k » Sun Feb 24, 2019 6:53 pm

By using the gibbs free energy equation, you see the relationship between each component.


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