Entropy changes


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Entropy changes

Postby JukaKim_1D » Fri Jan 29, 2016 12:56 pm

Why is it that when calculating for entropy change delta S is equal to either nRlnV2/V1 or nClnT2/T1 but when using pressure, it is nRlnP1/P2?

Nathan Danielsen 1G
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Joined: Fri Sep 25, 2015 3:00 am

Re: Entropy changes

Postby Nathan Danielsen 1G » Fri Jan 29, 2016 2:27 pm

According to the noble gas equation, PV=nRT, pressure is the inverse of volume, all other things being held constant. Since those equations for entropy are derived from the noble gas equation, using P1/P2 will give you the correct value.

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