Entropy of Surroundings vs Entropy of Systems

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805329408
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Joined: Wed Nov 20, 2019 12:21 am

Entropy of Surroundings vs Entropy of Systems

Postby 805329408 » Mon Feb 10, 2020 9:31 pm

For reversible reactions, the delta s system is always equivalent to negative delta s surroundings which is equal to delta s system. However, for irreversible reactions, is delta s surroundings always equal to 0? Why? Thanks in advance!

jisulee1C
Posts: 149
Joined: Thu Jul 25, 2019 12:17 am

Re: Entropy of Surroundings vs Entropy of Systems

Postby jisulee1C » Tue Feb 11, 2020 5:58 pm

In a reversible reaction there is a change of entropy and because it is isothermal delta U will be zero. However, in an irreversible reaction there is no work done because only free expansion occurs. Therefore since w = 0 and delta U = 0 the q = 0 so the q of surroundings =0 and delta S of the surroundings = 0. There's a section in the textbook that explains this concept more into detail (4I.2 example 4I.3).


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