State which of these two Group 2 carbonates needs the higher temperature before decomposition starts. Explain your answer.
Once decomposition is complete, the $0.02\ \text{mol}$ sample of calcium oxide is placed in $2.00\ \text{dm}^3$ of water. A solution forms and no solid is present. Dilute sulfuric acid is then added drop by drop until a precipitate is observed. The same procedure is then carried out with the $0.02\ \text{mol}$ sample of barium oxide, using dilute sulfuric acid of the same concentration. Identify the sample for which the greater amount of sulfuric acid must be added for a precipitate to appear. Explain your answer. You should refer to the solubilities of the precipitates and the relevant energy terms in your answer.
Calculate the mass, in g, of $\text{CO}_2$ made when $0.020$ moles of calcium carbonate decompose.
Calculate the minimum mass, in g, of propane that would, when completely combusted, produce the same mass of $\text{CO}_2$ found in (c)(i). Give your answer to three significant figures.