Entropy of the System for irreversible expansions
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 115
- Joined: Sat Sep 07, 2019 12:16 am
Entropy of the System for irreversible expansions
What is the difference between the change in entropy for a reversible isothermal expansion vs an irreversible expansion? Are they exactly the same?
-
- Posts: 56
- Joined: Thu Jul 25, 2019 12:16 am
Re: Entropy of the System for irreversible expansions
Yes, they are the same because entropy is a state function.
-
- Posts: 100
- Joined: Wed Sep 18, 2019 12:19 am
Re: Entropy of the System for irreversible expansions
State functions means that the path doesn't matter so it is the same.
-
- Posts: 115
- Joined: Sat Sep 07, 2019 12:16 am
Re: Entropy of the System for irreversible expansions
Also,
When is the change in internal energy zero for an irreversible expansion?
When is the change in internal energy zero for an irreversible expansion?
-
- Posts: 127
- Joined: Sat Aug 17, 2019 12:18 am
- Been upvoted: 2 times
Re: Entropy of the System for irreversible expansions
Amir Bayat wrote:Also,
When is the change in internal energy zero for an irreversible expansion?
Internal energy is zero when Temperature is constant because there is no energy transfer if there is no change in temperature ( Internal energy measure the heat transfer) so there is none if temperature isn't changing. DeltaU= DeltaH-Deltan*R*T so if there is no temp change it all comes to be deltaU=0
-
- Posts: 58
- Joined: Mon Jun 17, 2019 7:24 am
Re: Entropy of the System for irreversible expansions
i believe they are the same, or at least you assume its always reversible
Re: Entropy of the System for irreversible expansions
Since entropy is a state function, that means the path you take does not matter, so they will technically be the same.
-
- Posts: 139
- Joined: Sat Sep 07, 2019 12:16 am
Re: Entropy of the System for irreversible expansions
entropy is the same in both scenarios because entropy is a state function. It doesn't matter what path you take to get the change in entropy, it will be the same.
-
- Posts: 112
- Joined: Wed Sep 30, 2020 9:54 pm
- Been upvoted: 1 time
Re: Entropy of the System for irreversible expansions
Entropy will be the same because it is a state function.
Hope it helps!
Hope it helps!
Return to “Concepts & Calculations Using Second Law of Thermodynamics”
Who is online
Users browsing this forum: No registered users and 4 guests