magnesium and iron are metallic elements. how does a mole of magnesium compare with a mole of iron?\na mole…

Brief Explanations:

A mole is a unit that represents Avogadro's number ($6.022\times 10^{23}$) of entities (such as atoms). So, one - mole of any substance contains the same number of entities. The molar mass of magnesium ($Mg$) is approximately 24.31 g/mol and that of iron ($Fe$) is approximately 55.85 g/mol, so they have different masses. But in terms of the number of atoms, one mole of magnesium and one mole of iron both have $6.022\times 10^{23}$ atoms.

Answer:

D. They both have the same number of atoms.