## Hw 9.43

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

Peter Dis1G
Posts: 97
Joined: Fri Sep 29, 2017 7:04 am

### Hw 9.43

So for this one, can someone explain why we are treating one (either hot or cold water) as system and the other as surroundings? Because the heat transfer is happening only at those two?

Sarah_Stay_1D
Posts: 57
Joined: Sat Jul 22, 2017 3:00 am
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### Re: Hw 9.43

Peter Dis1G wrote:So for this one, can someone explain why we are treating one (either hot or cold water) as system and the other as surroundings? Because the heat transfer is happening only at those two?

Note that the problem states that this reaction is occurring in a thermally insulated vessel. This means that neither matter nor heat are being exchanged with the surroundings *outside* the vessel. Therefore, in this problem when we are looking at the deltaS total, it would include everything inside the vessel.