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

magnesium and iron are metallic elements. how does a mole of magnesium compare with a mole of iron? a mole of iron has more atoms. they both have the same mass. a mole of magnesium has more mass. they both have the same number of atoms.

magnesium and iron are metallic elements. how does a mole of magnesium compare with a mole of iron? a mole of iron has more atoms. they both have the same mass. a mole of magnesium has more mass. they both have the same number of atoms.

Answer

Answer:

D. They both have the same number of atoms.

Explanation:

Step1: Recall Avogadro's number

By definition, one - mole of any substance contains Avogadro's number ($N_A = 6.022\times10^{23}$) of entities (in this case, atoms).

Step2: Apply to magnesium and iron

Whether it is a mole of magnesium or a mole of iron, the number of atoms in each sample is $6.022\times10^{23}$. So, a mole of magnesium and a mole of iron have the same number of atoms. The mass of a mole of a substance (molar mass) is different for magnesium ($M_{Mg}=24.31\ g/mol$) and iron ($M_{Fe} = 55.85\ g/mol$), so they do not have the same mass.