Question

what is avogrado number ? is it variable or fixed
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Answer 1

The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6.02214076 × 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in the unit mol−1 and is called the Avogadro number.

Answer 2

Avagadro number is a fixed number that represents the number of particles in 1 mole of a substance.

1 pair= 2

1 dozen= 12

Similarly, 1 mole = Avagadro number

= 6.022*10²³