Change in entropy when temperature changes

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Drishti_Jain_1D
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Joined: Fri Jul 22, 2016 3:00 am

Change in entropy when temperature changes

Postby Drishti_Jain_1D » Sun Feb 12, 2017 6:34 pm

For some textbook problems, the change in entropy when temperature changes uses the equation S=nCln(T2/T1) and for some, the equation S=nRln(T2/T1) is used. How do you know which equation to use under certain conditions?

Chem_Mod
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Re: Change in entropy when temperature changes

Postby Chem_Mod » Sun Feb 12, 2017 10:29 pm

This comes from , when does q equal , and when does q equal ? The first one is when you are calculating the q (and subsequently entropy) of a substance with a specific heat of C (needs to be defined with const. V or P). And then the second one is used in work calculations (for an ideal gas).


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