Difference between revisions of "PChem312 f20 w13"
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| Line 8: | Line 8: | ||
:[[File:Screen Shot 2020-11-09 at 8.42.24 AM.png|200px]] | :[[File:Screen Shot 2020-11-09 at 8.42.24 AM.png|200px]] | ||
| − | 1) Reversible Isothermal Expansion or Compression | + | :1) Reversible Isothermal Expansion or Compression |
:::V<sub>i</sub>T<sub>i</sub> --> V<sub>f</sub>T<sub>i</sub> | :::V<sub>i</sub>T<sub>i</sub> --> V<sub>f</sub>T<sub>i</sub> | ||
::::::[[File:Screen Shot 2020-11-11 at 7.31.58 AM.png|140px]] | ::::::[[File:Screen Shot 2020-11-11 at 7.31.58 AM.png|140px]] | ||
| − | 2) Constant P, V temperature change | + | :2) Constant P, V temperature change |
:::V<sub>i</sub>T<sub>i</sub> --> V<sub>i</sub>T<sub>f</sub> | :::V<sub>i</sub>T<sub>i</sub> --> V<sub>i</sub>T<sub>f</sub> | ||
:::P<sub>i</sub>T<sub>i</sub> --> P<sub>i</sub>T<sub>f</sub> | :::P<sub>i</sub>T<sub>i</sub> --> P<sub>i</sub>T<sub>f</sub> | ||
| Line 19: | Line 19: | ||
::::::[[File:Screen Shot 2020-11-11 at 7.37.17 AM.png|400px]] | ::::::[[File:Screen Shot 2020-11-11 at 7.37.17 AM.png|400px]] | ||
| − | 3) Changes in both V and T, constant P | + | :3) Changes in both V and T, constant P |
:::V<sub>i</sub>T<sub>i</sub> -->V <sub>f</sub>T<sub>f</sub> | :::V<sub>i</sub>T<sub>i</sub> -->V <sub>f</sub>T<sub>f</sub> | ||
::::::[[File:Screen Shot 2020-11-11 at 7.40.27 AM.png|550px]] | ::::::[[File:Screen Shot 2020-11-11 at 7.40.27 AM.png|550px]] | ||
| − | 4) Changes in both P and T, constant V | + | :4) Changes in both P and T, constant V |
:::V<sub>i</sub>T<sub>i</sub> -->V <sub>f</sub>T<sub>f</sub> | :::V<sub>i</sub>T<sub>i</sub> -->V <sub>f</sub>T<sub>f</sub> | ||
Revision as of 14:53, 11 November 2020
Monday, Nov 9, 2020
We will now highlight how to calculate entropy (ΔS) for four processes involving ideal gases:
- 1) Reversible Isothermal Expansion or Compression
- ViTi --> VfTi
- 2) Constant P, V temperature change
- ViTi --> ViTf
- PiTi --> PiTf
- 3) Changes in both V and T, constant P
- ViTi -->V fTf
- 4) Changes in both P and T, constant V
- ViTi -->V fTf
Example Problem 1
- (Please write out your complete solution and email to bes by next class period)
Consider a gas undergoing the following change under constant pressure (1.00 bar) conditions; calculate the change in entropy (ΔS): Vi = 10.0 L; Ti = 298 K; Tf = 398 K
Example Problem 2
- (Please write out your complete solution and email to bes by next class period)
Consider a gas undergoing the following change under constant volume (10.0 L) conditions; calculate the change in entropy (ΔS): Pi = 1.00 bar; Ti = 298 K; Tf = 398 K
Wednesday, Nov 11, 2020
- Review contributions to ΔS due to ΔT, ΔV, ΔP for ideal gas/closed system.
- Entropy of Phase Changes...
...continuing numbering from above...
- 5) Solid --> Liquid phase change (fusion/melting/freezing)
- - under constant pressure
- - under constant volume
- 6) Liquid --> gas phase change (vaporization/boiling/condensation)
- - under constant pressure
- - under constant volume