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A student heated 12.0 g of calcium carbonate in an open crucible and obtained 6.7 g of solid. Which evaluation is correct?

Answer and explanation

Correct answer: Carbon dioxide was produced by the decomposition of calcium carbonate and escaped from the open crucible; total mass would be conserved in a closed system.

During thermal decomposition, \(\mathrm{CaCO_3(s) \rightarrow CaO(s) + CO_2(g)}\). Since 100 g of \(\mathrm{CaCO_3}\) produces 56 g of \(\mathrm{CaO}\), 12.0 g should produce \(12.0 \times 56/100 = 6.72\) g of solid, consistent with 6.7 g. The \(\mathrm{CO_2}\) gas escapes from the open crucible, so weighing only the solid gives a lower mass. In a closed system, the combined mass of the solid and gas remains conserved.

Related tags

Chemical ReactionsChemical EquationsConservation Of MassThermal DecompositionCalcium Carbonate

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