MediumChemistryHigh School (9–10)GeneralChemical Reactions › Chemical EquationsChemical Reactions › Energy Changes and CorrosionNumericalBoard Exam
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
Have you tried it?
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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