Question

Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?

Answer 1

They both have the same number of atoms. The molar mass of CO2 is 44.01 g/mol.

Answer 2

One mole of any substance is equal to Avogadro’s number, 6.023 x 10²³  

A mole of magnesium = a mole of iron = Avogadro’s number, 6.023 x 10 ²³

One mole of any element contains 6.023 x 10²³ number of atoms.  

One mole of any substance contains 6.023 x 10²³ number of atoms, molecules, ions, or formula units.