Atoms, molecules and stoichiometry — practice question

What total volume of gas is generated, at room conditions, when $0.010\,\text{mol}$ of anhydrous magnesium nitrate is fully decomposed on heating?

• A$240\,\text{cm}^3$
• B$480\,\text{cm}^3$
• C$600\,\text{cm}^3$
• D$720\,\text{cm}^3$