MediumChemistryHigh School (9–10)GeneralAtoms and Molecules › Laws of Chemical CombinationNumericalBoard Exam
80 g of calcium carbonate is heated strongly…
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 strongly. It breaks up into calcium oxide and carbon dioxide gas, and of calcium oxide is left. What mass of carbon dioxide was given off?
- In the same proportion, how much calcium oxide would of calcium carbonate give?
Need a reminder? The key ideaShow
In a chemical reaction mass is neither created nor destroyed: the total mass of the reactants equals the total mass of the products. Test it in a closed vessel, so that no gas escapes or enters.
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. (a) of carbon dioxide.
Step 2. The share. of the carbonate becomes calcium oxide.
Step 3. (b) .
Answer: (a) . (b) .
Check. The share is always , because calcium carbonate has a fixed composition.
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