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Yes, R in the equation PV=nRT is a constant so it is always equal to the same value. However, you have to match the value of R in terms of the units of the other values in the equation (P, V, n, and T). The units of R when it is equal to 0.082 is L/atm/K^-1/mol^-1, so in order to use .082 for R, V must be in liters, P must be in atmospheres, T must be in Kelvin, and n must be in mol (which is usually the case, hence why we use .082 for R most of the time).
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