100 g of calcium carbonate was heated until it decomposed to give calcium oxide and carbon dioxide. 56 g of calcium oxide was left. Work out the mass of carbon dioxide given off.
Question
100 g of calcium carbonate was heated until it decomposed to give calcium oxide and carbon dioxide. 56 g of calcium oxide was left. Work out the mass of carbon dioxide given off.
Solution
The problem involves a decomposition reaction where calcium carbonate (CaCO3) decomposes into calcium oxide (CaO) and carbon dioxide (CO2) when heated. The reaction can be represented as follows:
CaCO3 → CaO + CO2
We know that 100 g of calcium carbonate decomposed to give 56 g of calcium oxide. The mass of carbon dioxide can be found by subtracting the mass of calcium oxide from the original mass of calcium carbonate.
So, the calculation would be:
100 g (initial mass of CaCO3) - 56 g (final mass of CaO) = 44 g
Therefore, 44 g of carbon dioxide was given off.
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