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If external pressure is constant then you can use the irreversible equation. In addition, the reversible equation is theoretical, so in most "real world" situations, I feel like it's more likely that we would have to use the irreverisble equation.
The equation for irreversible expansion is the one that is used more often and is more common. I'm pretty sure you'd only need to use the equation for reversible expansion if the pressure is not constant.
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