## Reversible v. Irreversible

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

Mayvera Doaran 2H
Posts: 23
Joined: Fri Sep 25, 2015 3:00 am

### Reversible v. Irreversible

For entropy, which equations do you use for isothermal reversible vs. irreversible free expansion? What does free expansion mean?

Chem_Mod
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### Re: Reversible v. Irreversible

If it's isothermal and reversible you can use $\Delta S=\frac{q_{rev}}{T}$. If it were to irreversible free expansion (no external pressure, thus work=0), by the second law of thermodynamics the entropy of the universe is increasing.

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