Entropy of the System for irreversible expansions

[Amir Bayat]

What is the difference between the change in entropy for a reversible isothermal expansion vs an irreversible expansion? Are they exactly the same?

[Cole Woulbroun 1J]

Yes, they are the same because entropy is a state function.

[Cooper Baddley 1F]

State functions means that the path doesn't matter so it is the same.

[Amir Bayat]

Also,

When is the change in internal energy zero for an irreversible expansion?

[KaleenaJezycki_1I]

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

[Bryan Chen 1H]

i believe they are the same, or at least you assume its always reversible

[205389184]

Since entropy is a state function, that means the path you take does not matter, so they will technically be the same.

[Rida Ismail 2E]

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.

[Lorraine Jiang 2C]

Entropy will be the same because it is a state function.

Hope it helps!