## Converting to q rev

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

Marsenne Cabral 1A
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

### Converting to q rev

Even if the reaction you have is irreversible, do you still use change in entropy= qrev/T?

Yousif Jafar 1G
Posts: 59
Joined: Thu May 10, 2018 3:00 am

### Re: Converting to q rev

unless it is isothermal and irreversible, you use the other formulas were change in entropy is =nRlnT2/T1

Yvonne Du
Posts: 64
Joined: Fri Sep 28, 2018 12:23 am

### Re: Converting to q rev

Yes, qrev/Delta T would be the formula for irreversible reaction.

ryanhon2H
Posts: 60
Joined: Fri Sep 28, 2018 12:28 am

### Re: Converting to q rev

Because entropy is a state function, the change will be the same regardless of whether the reaction is reversible or not, since it is not path dependent, so you can use qrev/T, as long as the reaction is isothermal. If it is isobaric (constant pressure), isochoric (constant volume), etc you would have to use a different equation.

105169446
Posts: 32
Joined: Fri Sep 28, 2018 12:16 am

### Re: Converting to q rev

When the change in entropy is reversible, you can also use delta S = nrln(V2/V1) or delta S = nCln(P1/P2) because pressure is inversely related to volume.