A mole.
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atoms in 12 g of c-12
The unit is "per mole", or mol^-1.
Directly proportional, at pressure and temperature constant.
Avogadro's number represents the number of units of a substance in one mole of the substance. These units may be electrons, atoms, ions, or molecules, depending on the substance.
The Avogadro constant is the number of constituent particles, usually atoms or molecules, that are contained in the amount of substance given by one mole. The number is approx 6.02214086*10^23 mol-1