Question

si unit of amount of substance

Answer 1

Mole is a unit of measurement of amount of any substance.
1 mole of any substance is equal to the number of particles which may be atoms, molecules, ions, electrons etc, present in it.
Avogadro's number, i.e. 6.022$\times$10²³ is equal to 1 mole. 6.022×10is equal to one mole.