## internal energy

$\Delta U=q+w$

FrankieClarke2C
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### internal energy

Is the change in internal energy for irreversible expansion always 0?

Chem_Mod
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### Re: internal energy

No, only for isothermal irreversible process the change in internal energy is 0

David Sarkissian 1K
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### Re: internal energy

Shouldn't it be only isothermal, reversible reactions that have a $\Delta U$= 0, not irreversible? I'm just confused because example 8.5 in the book says the same about reversible, opposed to irreversible.

Edit: Actually the example puts both a reversible and irreversible reactions $\Delta U$= 0, so I'm even more confused now.

Jack DeLeon 1B
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

### Re: internal energy

isothermal reactions have a deltaU of 0. not sure about reversible or irreversible