Calcium carbonate breaks down on heating to produce calcium oxide and carbon dioxide gas.
CaCO3 CaO CO2
A student heats 15 g of calcium carbonate strongly in a crucible.
Relative atomic masses (Ar): Ca 40, C 12, O 16.
a Calculate the number of moles in 15 g of calcium carbonate. (2 marks)
b Use your answer to part a to determine the number of moles of calcium oxide that will be produced. (1 mark)
c Calculate the mass of calcium oxide produced by this reaction. (2 marks)
4 A student is preparing a sample of sodium nitrate, NaNO3.
She mixes 17 g of sodium oxide with an excess of nitric acid. The equation for the reaction is:
Na2O 2HNO3 2NaNO3 H2O
Relative atomic masses (Ar): Na 23, O 16, N 14, H 1.
a Calculate the number of moles in 17 g of sodium oxide. (2 marks)
b Calculate the maximum mass of sodium nitrate that can be produced in this reaction. (3 marks)
5 Aluminium and iron oxide (Fe2O3) react together to produce aluminium oxide (Al2O3). The equation for the reaction is:
2Al Fe2O3 Al2O3 2Fe
Calculate the mass of iron that is produced by reacting 20 g of iron oxide with an excess of aluminium.
Relative atomic masses (Ar): Al 27, O 16, Fe 56. (4 marks)
Answers
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Answer:
a. 6 moles are present
b. 0.244 moles
c. 13.68 g
4)
a. 3.6 moles
b. 46 grams
Explanation:
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