Avogadro's constant

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See for more details Avogadro's number.

The SI definition of Avogadro's constant (designated NA) is: the number of entities (such as atoms, ions, or molecules) per mole. (This definition requires a definition of mole that does not rely on NA, but one that is in terms of 12C atoms). The constant NA has dimension mol−1. The numeric value of Avogadro's constant is NA = 6.022 140 76 x 1023 mol−1.

Reference:

https://www.nist.gov/si-redefinition/meet-constants

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