Question

Which contains more atoms: a mole of iron or a mole of oxygen gas?

Answer 1

Explanation:

mole of any element contains the same number of atoms. Look up Avogadro’s number.

A mole of Fe and a mole of H each contain the same number of atoms.

But, H2 has 2 atoms per molecule. So, 1 mole of H2 has twice as many atoms as 1mole of Fe.