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Use for volume and atm for pressure. Even if the question gives you a pressure unit that is not in atm, converting to atm might help make answering easier. The conversion between the various pressure units will be on the formula sheet.
If you use the equation w = -P∆V, the units are kg/m⋅s² (m³) ,which is equal to kg⋅m²/s², which is the equivalent of Joules. Alternatively, you could multiply by 101.325 J/L⋅atm, which would result in work with units of Joules.
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