## Reversible and Irreversible entropy equations

$\Delta S = \frac{q_{rev}}{T}$

JonathanZhu3B
Posts: 8
Joined: Wed Sep 21, 2016 2:55 pm

### Reversible and Irreversible entropy equations

I'm confused on which equations to use for the reversible and irreversible entropy problems. The equation Delta(S) = NR(lnV2/V1) is reversible, but can this still be used to solve an irreversible problem assuming that the change in entropy is not 0? So if you were to use this equation for an irreversible problem you could assume there is no reversible reaction that is the opposite sign and causes change in entropy to be 0. Does this apply for any reversible equation you can use for work or entropy?

Thomas_Rodriguez_3G
Posts: 12
Joined: Wed Sep 21, 2016 2:58 pm

### Re: Reversible and Irreversible entropy equations

I think thats how things work, although i will admit irreversible reactions don't seem to come up a lot in the textbook.

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