Question

define Avogadro constant and molar mass? how are the related to one mole of an atom of a molecular or iron

Answer 1

Avogadro Constant is defined as the no: of particles i.e includes atoms, molecules or compounds, present in 1 mole of any substance has a fixed value .Avogadro Constant = 6.022 × 10²³

OR
The no : of particles present in 1 mole of any substance is fixed , 6.022× 10²³.This fixed value is called Avogadro constant

1 mole of any substance = 6.022× 10²³ particles.

Molar mass is the mass of 1 mole of a substance.