Derivation of isothermal entropy equations

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Wenting Hu 2H
Posts: 33
Joined: Fri Sep 29, 2017 7:06 am

Derivation of isothermal entropy equations

Postby Wenting Hu 2H » Thu Feb 08, 2018 8:41 pm

For questions like 9.9, why is it that when you sub -w in for q under isothermal conditions, it becomes dS=+PdV/T? Shouldn't it be -PdV?
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Tanaisha Italia 1B
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Re: Derivation of isothermal entropy equations

Postby Tanaisha Italia 1B » Fri Feb 09, 2018 12:05 am

I think that the question means isothermal reversible expansion (nRT * ln(V2/V1) ) rather than irreversible expansion (-PdeltaV), because the temperature is constant and the amount of work is maximized.
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