Reversible and Isobaric

[Jielena_Bragasin2G]

Can I assume that an isobaric expansion is irreversible since the equation for irreversible expansion is Next*deltaV ?

[Joseph Saba]

I would only do the calculation for irreversible reactions if the problem says specifically.

[ALegala_2I]

The irreversible equation is only used when pressure is constant. If pressure is changing, then you use the reversible equation.

[Morgan Carrington 2H]

I believe that isobaric means constant pressure and in order for that equation to be used, the external pressure has to be held constant. I would be cautious using this though unless it specifically said that the process was irreversible or reversible.

[CameronDis2K]

Isobaric means that deltaP = 0, but doesn't say if the process is reversible or irreversible. Therefore, the only assumption one can make is that U = detaH - pdeltaV (as there is only one P value to plug in, usually external pressure).