AP Chemistry Unit 7.1: Dynamic Equilibrium

When heated, calcium carbonate decomposes according to the equation above. In a study of the decomposition of calcium carbonate, a student added a 50.0 g sample of powdered $\mathrm{CaCO}_{3}(s)$ to a 1.00 L rigid container. The student sealed the container, pumped out all the gases, then heated the container in an oven at 1100 K. As the container was heated, the total pressure of the $\mathrm{CO}_{2}(g)$ in the container was measured over time. The data are plotted in the graph below.

The student repeated the experiment, but this time the student used a 100.0 g sample of powdered $\mathrm{CaCO}_{3}(s)$. In this experiment, the final pressure in the container was 1.04 atm, which was the same final pressure as in the first experiment.

The student claimed that the final pressure in the container in each experiment became constant because all of the $\mathrm{CaCO}_{3}(s)$ had decomposed. Based on the data in the experiments, do you agree with this claim? Explain.