Question

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)

Answer 1

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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