9.37

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Cam Bear 2F
Posts: 60
Joined: Thu Jul 27, 2017 3:01 am

9.37

Postby Cam Bear 2F » Thu Feb 08, 2018 2:51 pm

For this problem, I was just wondering what the difference was between and ? Thanks!

Cali Rauk1D
Posts: 51
Joined: Fri Sep 29, 2017 7:03 am

Re: 9.37

Postby Cali Rauk1D » Thu Feb 08, 2018 5:30 pm

I believe that delta s of f is the formation and delta s of r is the reaction.

Katherine Jordak 1H
Posts: 51
Joined: Fri Sep 29, 2017 7:05 am

Re: 9.37

Postby Katherine Jordak 1H » Fri Feb 09, 2018 1:13 pm

How do we know when we need to use the standard entropy change or formation and when to use the standard entropy change of reaction?

Jenny Cheng 2K
Posts: 30
Joined: Fri Sep 29, 2017 7:05 am
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Re: 9.37

Postby Jenny Cheng 2K » Fri Feb 09, 2018 2:20 pm

For this problem, you are finding ΔS(rxn) by using ΔS(m), the standard molar entropy (which is the entropy of 1 mol of substance).
Use ΔS(rxn)=ΣnΔS(m)(products)-ΣnΔS(m)(reactants)

I think ΔS(rxn) refers to the entropy of the entire reaction, and ΔS(f) refers to the entropy of formation of a substance.


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