Delta U for Reversible and Irreversible

[Venya Vaddi 1L]

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]

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]

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

[Cameron_Greenberg_3C]

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.

[Cara W]

It is also important to note that when there is an isothermal, irreversible "free expansion," this implies that the system does not do any expansion work, and therefore w=0.