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Copper carbonate, CuCO₃, decomposes when heated - OCR Gateway - GCSE Chemistry - Question 10 - 2021 - Paper 2
Question 10
Copper carbonate, CuCO₃, decomposes when heated. Copper oxide, CuO, and carbon dioxide gas are made. CuCO₃ → CuO + CO₂ 12.4 g of copper carbonate decomposes to mak... show full transcript
Worked Solution & Example Answer:Copper carbonate, CuCO₃, decomposes when heated - OCR Gateway - GCSE Chemistry - Question 10 - 2021 - Paper 2
Step 1
How much carbon dioxide gas is made?
Answer
To determine how much carbon dioxide gas is produced during the decomposition of copper carbonate, we start with the balanced chemical equation:
From the problem, we know that 12.4 g of copper carbonate decomposes to yield 8.0 g of copper oxide. We can first find the mass of carbon dioxide produced using the law of conservation of mass.
Step 1: Calculate the mass lost
The total mass before the reaction is the mass of copper carbonate:
- Initial mass (CuCO₃) = 12.4 g
- Mass of copper produced (CuO) = 8.0 g
Step 2: Use the mass conservation principle
The mass of the products must equal the mass of the reactants:
Conclusion
Thus, the mass of carbon dioxide gas made is 4.4 g. The correct answer is B.