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R is the universal gas constant that can be in many different variations in terms of units. However, for this class, I believe we will be primarily focusing on R= 8.3145 J/mol·K since T in PV=nRT will be in Kelvin as Dr. Lavelle stated in class. Hope this helps!
The Units for PV=nRT depend on what you are solving for. Normally V will be in liters, P will be in atm, T will ALWAYS be in Kelvin, and n will be in moles. R is a constant whose value depends on the units of the other components. Say you were solving for P with the units given above, the equation would read nRT/V and the units of R would be L*atm/(K*mol). This would allow everything to cancel except atm, the unit for pressure.
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