How to Determine if Internal Energy (U) Changes?

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Xin Huang 3E
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Joined: Wed Sep 21, 2016 2:57 pm

How to Determine if Internal Energy (U) Changes?

Postby Xin Huang 3E » Wed Jan 25, 2017 10:25 pm

Hi, I noticed that on course reader p.33 there are two graphs showing reversible and irreversible pathways. One of them (Path A) has constant temperature, while the other has changing T. But it seems that for both of them ΔU = 0 (since q = -w for both of them). I originally thought that ΔU = 0 for constant temperature, but it seems that it's not the case. How can I determine if internal energy (U) changes then?

Chem_Mod
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Re: How to Determine if Internal Energy (U) Changes?

Postby Chem_Mod » Tue Jan 31, 2017 9:38 am

To determine delta U, you will need additional information, is the system adiabatic, or is it isolated or open. It is easier for you to see this, if you can pull up specific questions in the HW.


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