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When calcium carbonate is heated in an intact closed container, it decomposes into calcium oxide and carbon dioxide. If the carbon dioxide does not escape, what can be concluded about the total mass of the container and its contents before and after the reaction?

Answer and explanation

Correct answer: The total mass will remain unchanged

The reaction is \(\mathrm{CaCO_3(s) \rightarrow CaO(s) + CO_2(g)}\). In an intact closed container, no matter, including \(\mathrm{CO_2}\), leaves the system, so the total mass of the container and all its contents remains unchanged. Option B could apply to an open container, where escaping \(\mathrm{CO_2}\) can make the measured mass decrease.

Related tags

Chemical ReactionsConservation Of MassCalcium CarbonateThermal DecompositionClosed SystemClass 10

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