Samples with equal masses of $\text{CaCO}_3$, $\text{Ca(NO}_3)_2$, $\text{BaCO}_3$ and $\text{Ba(NO}_3)_2$ are heated so that they decompose thermally. For each experiment, the gas volume formed is recorded under identical conditions. Which compound would give the largest volume of gas?
- A$\text{CaCO}_3$
- B$\text{Ca(NO}_3)_2$
- C$\text{BaCO}_3$
- D$\text{Ba(NO}_3)_2$