Equal masses of $\mathrm{CaCO_3}$, $\mathrm{Ca(NO_3)_2}$, $\mathrm{BaCO_3}$ and $\mathrm{Ba(NO_3)_2}$ are heated until they thermally decompose. The gas volume from each experiment is then measured under identical conditions. Which compound will produce the largest volume of gas?
- A$\mathrm{CaCO_3}$
- B$\mathrm{Ca(NO_3)_2}$
- C$\mathrm{BaCO_3}$
- D$\mathrm{Ba(NO_3)_2}$