## reaction entropy

Kyle Rex 1K
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Joined: Sat Aug 17, 2019 12:16 am

### reaction entropy

is solving for reaction entropy like the same as solving for reaction enthalpy where its the sum of products molar entropy - sum of reactants molar entropy or is there another formula we have to use?

Zaynab Hashm 2I
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### Re: reaction entropy

we use, ΔS° = ΣS°(products) - ΣS°(reactants), and i think we can also calculate ΔS using some of the formulas found on the formula sheet, but that depends on what is known/unknown and the system of the reaction

Ariel Davydov 1C
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### Re: reaction entropy

You can also calculate deltaG the same way.

Kaitlyn Ang 1J
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### Re: reaction entropy

Ariel Davydov 1C wrote:You can also calculate deltaG the same way.

I think for any state function you can calculate it this way because all we care about is the change from initial to final so in reactions, the “final” stage is the products and the “initial” stage is the reactants, so you would do products - reactants, which is what you do for deltaS, deltaG, and deltaH

JasonLiu_2J
Posts: 109
Joined: Sat Aug 24, 2019 12:17 am

### Re: reaction entropy

Since entropy, like enthalpy, is a state function, you can find entropy of reaction by doing standard entropy of products minus the standard entropy of the reactants (multiplying each by the stoichiometric coefficients. It's also good to know that for enthalpy and Gibbs free energy, you are using the enthalpy of formation and gibbs free energy of formations, respectively, whereas for entropy, you are using the standard molar entropies of the reactants and products.

Posts: 102
Joined: Tue Oct 02, 2018 12:16 am

### Re: reaction entropy

It will be the products minus the reactants to find the net change. This applies to other state functions as well.

Posts: 104
Joined: Fri Aug 09, 2019 12:16 am

### Re: reaction entropy

Yes, this can be done because it is also a state function.

Anna Chen 1K
Posts: 104
Joined: Thu Jul 25, 2019 12:18 am

### Re: reaction entropy

You can use the equation ΔS° = ΣS°(products) - ΣS°(reactants) to solve for entropy of a reaction since entropy is a state function.

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