delta S=qrev/t


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Jessica Castellanos
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delta S=qrev/t

Postby Jessica Castellanos » Sun Feb 16, 2020 7:07 pm

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

Postby Ariana Iranmahboub1G » Sun Feb 16, 2020 7:22 pm

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
Posts: 109
Joined: Thu Jul 11, 2019 12:15 am

Re: delta S=qrev/t

Postby Daniel Honeychurch1C » Sun Feb 16, 2020 7:22 pm

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

Postby Kylie Lim 4G » Sun Feb 16, 2020 7:32 pm

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

Postby Shimei_2F » Sun Feb 16, 2020 7:43 pm

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


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