MediumChemistryHigh School (9–10)GeneralChemical Reactions › Chemical EquationsChemical Reactions › Energy Changes and CorrosionNumerical
200 g of calcium carbonate is heated until it has all broken up: CaCO₃ → CaO + CO₂.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
of calcium carbonate is heated until it has all broken up: . Find the masses of calcium oxide and carbon dioxide made. Use , and .
Need a reminder? The key ideaShow
The coefficients of a balanced equation give the ratio of moles. Grams to moles: ; use the ratio; moles to grams: . The total mass of the reactants equals the total mass of the products.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Moles. .
Step 2. Calcium oxide. .
Step 3. Carbon dioxide. .
Check. .
Answer: of CaO and of .
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