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When you plug in all the variables in the pv=nRT equation, you want to make sure all the units cancel out. The correct unit should give you only moles or some kind of pressure unit at the end (after the cancellation of units).
I think the question would state which units you need to use. If not, pay attention to the units of pressure. For example, if you are given the pressure in order to find the volume, you should use the R constant that has the same units as pressure in order for them to cancel out each other.
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