## entropy in reversible/irreversible processes

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

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Simrina Desar Dis 1H
Posts: 49
Joined: Fri Sep 29, 2017 7:04 am

### entropy in reversible/irreversible processes

If entropy is a state function and therefore the pathway to get to the end state does not matter, why are there different equations for entropy based on whether the pathway is reversible vs irreversible?

Aya Shokair- Dis 2H
Posts: 58
Joined: Fri Sep 29, 2017 7:07 am

### Re: entropy in reversible/irreversible processes

When calculation the change in entropy we use the basic equation of:
ΔS= q(rev)/T

I remember reading in the book that we assume all the work done is reversible when we use work to calculate ΔS. (ΔU=0, so q=-w)

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