Boltzmann Equation for Entropy:
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The NA represents the number of molecules or atoms in the system, so if there are 2 molecules of C02, for example, the NA would be 2. If you have one mole of CO2, the amount of molecules of CO2 is given by avogadro's number so NA would be Avogadro's number.
NA is the number of particles per mole. For example, if the problem gives us mols to work with, we know that the degeneracy W=(number of possible positions of an atom)^(number of moles x Avogadro's number). However, if you are given particles to work with, W=(number of possible positions of an atom)^(number of particles).
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