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

The correct answer is (D) They both have the same number of atoms.

The Explanation:

as we compare 1 mole of Mg with 1 mole iron so they have the same number of moles .

and when the number of atoms = number of moles * Avogadro's number

= 6.02 x 10^23

∴ both have the same number of atoms

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.