Question

How many moles of oxygen atoms are present in ${\mathrm{Fe}}_2{\mathrm{O}}_3$.

Answer 1

• The number of atoms present in one molecule of ${\mathrm{Fe}}_2{\mathrm{O}}_3$ is 3.
• Hence the number of moles of oxygen present ${\mathrm{Fe}}_2{\mathrm{O}}_3$ is 3 moles of oxygen.