Ideal Situation vs. Real Situation


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Connie2I
Posts: 29
Joined: Fri Sep 29, 2017 7:07 am

Ideal Situation vs. Real Situation

Postby Connie2I » Fri Feb 02, 2018 12:03 am

In real life situations, why is delta S always greater than Q(rev)/T unlike the ideal situation where delta S is equal to Q(rev)/T?

Wilson Yeh 1L
Posts: 42
Joined: Fri Sep 29, 2017 7:06 am

Re: Ideal Situation vs. Real Situation

Postby Wilson Yeh 1L » Fri Feb 02, 2018 10:56 am

The volume of real gases are greater and harder to compress. Because of this, entropy of real gases are greater than entropy of ideal gases.

Sirajbir Sodhi 2K
Posts: 47
Joined: Sat Jul 22, 2017 3:00 am

Re: Ideal Situation vs. Real Situation

Postby Sirajbir Sodhi 2K » Fri Feb 02, 2018 1:24 pm

A non-ideal gas intermolecular attractions, meaning that the particles will attract each other, reducing total microstates and entropy.

In an ideal gas, there are no intermolecular attractions so the gas has the largest number of microstates.

Entropy of an ideal gas > Entropy of a real gas.

This discrepancy is what leads to the phenomenon in your question.


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