Irreversible Entropy Changes

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mcredi
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

Irreversible Entropy Changes

Postby mcredi » Tue Feb 12, 2019 7:52 pm

When talking about entropy change due to temperature change when the process was done irreversibly, why do we use deltaS = nRln(t/t)

Elisa Bass 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

Re: Irreversible Entropy Changes

Postby Elisa Bass 4L » Tue Feb 12, 2019 8:44 pm

Because ∆S = qrev/T, if you’re looking for change in entropy due to temperature change, you can substitute out q for nC∆T, then simplify to get ∆S = nCln(T2/T1).


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