Photo AI
Two students heat some calcium carbonate, CaCO3 - OCR Gateway - GCSE Chemistry - Question 19 - 2018 - Paper 1
Question 19
Two students heat some calcium carbonate, CaCO3. Look at the equation for the reaction. CaCO3(s) → CaO(s) + CO2(g) Calcium carbonate → Calcium oxide + Carbon diox... show full transcript
Worked Solution & Example Answer:Two students heat some calcium carbonate, CaCO3 - OCR Gateway - GCSE Chemistry - Question 19 - 2018 - Paper 1
Step 1
Step 2
Step 3
Is student A correct?
Answer
No, student A is incorrect. When heating 20g of calcium carbonate, he mistakenly asserts the products are 8.8g of calcium oxide and 11.2g of carbon dioxide. Applying stoichiometry and the law of conservation of mass, we find that the total mass of products must equal the mass of the reactants:
For 20g of calcium carbonate:
- The mass of calcium oxide produced must be less than 20g as some mass is lost to carbon dioxide.
- From calculations, 20g of calcium carbonate yields approximately 8.8g of calcium oxide and 11.2g of carbon dioxide — resulting in 20g total, but the ratio is incorrect with respect to the actual reaction.