## delta S=qrev/t

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

Jessica Castellanos
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### delta S=qrev/t

How do you calculate qrev for the equation delta S=qrev/t? Is it usually given or do you need to use other equations based on information given in the question?

Ariana Iranmahboub1G
Posts: 114
Joined: Fri Aug 09, 2019 12:17 am

### Re: delta S=qrev/t

It could be both. This equation also helped us derive the other equations for entropy such as S=nCIn(T2/T1) , S=nRIn(V2/V1), and S=nRIn(P1/P2). So sometimes you won't have to solve for qrev directly if you can use those equations.
Last edited by Ariana Iranmahboub1G on Sun Feb 16, 2020 7:23 pm, edited 1 time in total.

Daniel Honeychurch1C
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Joined: Thu Jul 11, 2019 12:15 am

### Re: delta S=qrev/t

You can calculate using q = mc(delta T). Or if there’s constant pressure, q(p) = delta H.

Kylie Lim 4G
Posts: 110
Joined: Sat Aug 17, 2019 12:15 am

### Re: delta S=qrev/t

Usually temperature will be given to you, and qrev just means q of a reversible reaction so you use the normal q=(heat capacity)(change in T).

Shimei_2F
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### Re: delta S=qrev/t

Sometimes it's given to you and other times, you're given the information to calculate it.