Calcium oxide, CaO\text{CaO}CaO, is a key ingredient in the manufacture of cement. It is produced industrially by the thermal decomposition of calcium carbonate, CaCO3\text{CaCO}_3CaCO3, found in limestone:
CaCO3→CaO+CO2\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2CaCO3→CaO+CO2
Calculate the mass of calcium oxide that could be made from 85.0 tonnes85.0\text{ tonnes}85.0 tonnes of calcium carbonate.
Relative atomic masses (ArA_rAr): C=12.0\text{C} = 12.0C=12.0, O=16.0\text{O} = 16.0O=16.0, Ca=40.0\text{Ca} = 40.0Ca=40.0
A chemist prepares a sample of calcium oxide in the laboratory.
The chemist predicts a theoretical yield of 8.50 g8.50\text{ g}8.50 g of calcium oxide.
If the chemist achieves a percentage yield of 84%84\%84%, calculate the actual mass of calcium oxide that is obtained.