CaCO3(s) ⇄ CaO(s) + CO2(g) When heated, calcium carbonate decomposes according to the equation above — Equilibrium Chemistry Question

CaCO₃(s) ⇄ CaO(s) + CO₂(g)

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 CaCO₃(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 CO₂(g) in the container was measured over time. The data are plotted in the graph below.

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The student repeated the experiment, but this time the student used a 100.0 g sample of powdered CaCO₃(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.