## S vs Stotal

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

vanessas0123
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Joined: Wed Sep 11, 2019 12:17 am

### S vs Stotal

What is the difference between delta S and delta S total?

Nathan Nakaguchi 1G
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### Re: S vs Stotal

$\Delta S_{total}=\Delta S _ {system} + \Delta S_{surrondings}$

Usually if its just $\Delta S$ then it is the change in entropy of the system, the total change in entropy refers to both the change in entropy by the system and the surroundings.

Abby Soriano 1J
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### Re: S vs Stotal

Typically delta S refers to the delta S of the system while delta S total (delta S of the system + delta S of the surroundings) refers to the delta S of the universe.

Posts: 113
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### Re: S vs Stotal

Delta S refers to the entropy of the system, and Delta Stotal refers to the total entropy (entropy of the system + entropy of the surroundings).

Andrew Liang 1I
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### Re: S vs Stotal

Delta S is usually referred to the change in entropy of the system. Change in entropy of the surrounding is written as delta S(sur).
Delta S total is the sum of delta S and delta S(sur)

Kayli Choy 2F
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### Re: S vs Stotal

Additionally, for isothermal reversible reactions, delta S total = 0, so delta S = -delta S(surroundings). For isothermal irreversible reactions, delta S(surroundings) = 0, so delta S total = delta S, and the entropy of the universe increases

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### Re: S vs Stotal

vanessas0123 wrote:What is the difference between delta S and delta S total?

What is meant by delta S, it is the entropy of the system.
Delta S total is the entropy of both the system and the surroundings.

Esha Chawla 2E
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### Re: S vs Stotal

vanessas0123 wrote:What is the difference between delta S and delta S total?

Delta S is simply the entropy of the system, while Delta S total accounts for the entropy of the system and the surroundings, or the universe.