In a firework, solid potassium nitrate, KNO3, decomposes to form solid potassium nitrite, KNO2, and oxygen, O2.
Write a balanced symbol equation for this reaction.
[1]
Use section 7 of the data booklet to calculate the amount, in g, of potassium nitrate, KNO3, required to make 1.5 g of oxygen. Give your answer to 2 significant figures.
[3]
Use section 2 of the data booklet to calculate the volume of gas at STP, in dm3, that is produced in the reaction outlined in part (a). Give your answer to 2 significant figures.
Potassium can form a superoxide, KO2 (s), which will react with carbon dioxide, CO2 (g), to produce potassium carbonate, K2CO3 (s) and oxygen, O2 (g), as shown in the equation below.
4KO2 (s) + 2CO2 (g) → 2K2CO3 (s) + 3O2 (g)
Calculate the amount, in moles, and therefore volume, in dm3, of carbon dioxide which will react with the superoxide. Give your answer to 3 significant figures.
[2]
A student calculated that 4.86 g of potassium carbonate, KCO3, should be produced during the reaction outlined in part (c), 2.61 g of potassium carbonate, KCO3, was produced when the experiment was carried out. Calculate the percentage yield for the production of potassium carbonate. Give your answer to 2 decimal places.
Did this page help you?