When calcium nitrate undergoes thermal decomposition, one of the products is oxygen. What volume of oxygen is formed under room conditions when $0.50\,\text{mol}$ of calcium nitrate undergoes thermal decomposition?
- A$6.0\,\text{dm}^3$
- B$12.0\,\text{dm}^3$
- C$18.0\,\text{dm}^3$
- D$30.0\,\text{dm}^3$