## Delta U for Reversible and Irreversible

$\Delta U=q+w$

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### Delta U for Reversible and Irreversible

Is delta U equal to zero for both reversible and irreversible reactions? If not, under what conditions is delta U equal to zero?

Andre_Galenchik_2L
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### Re: Delta U for Reversible and Irreversible

Delta U is equal to 0 when the work done by the system is equally replaced by heat being added into the system.

katie_sutton1B
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Joined: Fri Sep 28, 2018 12:17 am

### Re: Delta U for Reversible and Irreversible

Also, deltaU = 0 for the isothermal reaction(or compression) of an ideal gas.

Cameron_Greenberg_3C
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Joined: Fri Sep 28, 2018 12:26 am

### Re: Delta U for Reversible and Irreversible

In our class, (delta)U=0 for all reversible reactions. Irreversible ones will not equal zero if there is any expansion work. So if deltaV is not zero, there is energy transferred in the system.