Topic Reacting masses Level GCSE Outcomes 1. To calculate reacting masses 2. To set out mole calculations in a grid format
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1 Topic Reacting masses Level GCSE Outcomes 1. To calculate reacting masses 2. To set out mole calculations in a grid format Problems on Reacting Masses of Solids Section 1 1. What is the mass of magnesium oxide is formed by the complete combustion of 24 g of magnesium? Reaction 2Mg + O 2 2MgO 2. What is the mass of magnesium oxide is formed by the complete combustion of 6 g of magnesium? Reaction 2Mg + O 2 2MgO 3. What mass of carbon dioxide is formed by the complete combustion of 12 g of carbon? 4. What mass of carbon dioxide is formed by the complete combustion of 4 g of carbon? 5. Calculate the mass of sulphur that must be burned to give 64 g of sulphur dioxide. resources for science teachers who like to think
2 6. Calculate the mass of sulphur that must be burned to give 8 g of sulphur dioxide. 7. Calculate the mass of sulphur that must be burned to give 100 g of sulphur dioxide. 8. In the reduction of copper(ii) oxide by hydrogen, according the equation below, what mass of copper can be obtained from (i) 79.5 g of copper oxide (ii) 15.9 g of copper oxide (i) Reaction CuO + H 2 Cu + H 2 O (ii) Reaction CuO + H 2 Cu + H 2 O 9. What mass of carbon dioxide can be produced by the heating of 10 g 0f calcium carbonate? Reaction CaCO 3 CaO + CO What is the mass of hydrogen can be made by reacting 12 g of magnesium with an excess of dilute sulphuric acid? Reaction Mg + H 2 SO 4 MgSO 4 + H 2
3 11. What mass of carbon can be completely burned in 32 g of oxygen? 12. What mass of iron must be heated with excess sulphur to produce 4.4 g of iron (II) sulphide? Section 2 Reaction Fe + S FeS 1. Calculate the mass of carbon you would need to reduce 15.9 g of copper (II) oxide to copper by the following reaction. Reaction CuO + C Cu + CO 2. Iron will react with chlorine to form iron (III) chloride. Find the mass of iron (III) chloride that can be obtained from 8 g of iron. Reaction 2Fe + 3Cl 2 2FeCl 3 3. A mixture of 8 g of iron and 4 g of sulphur is heated, and the element reacts to form iron (II) sulphide, FeS. How much iron will be left over at the end of the reaction? Reaction Fe + S FeS Left over iron =
4 4. What mass of lead (II) oxide is obtained by heating 33.1 g of lead (II) nitrate in the following reaction? Reaction 2Pb(NO 3 ) 2 2PbO + 4NO 2 + O 2
5 Calculate the mass of carbon dioxide you can obtain by the action of acid on 15 g of calcium carbonate in the following reaction. Reaction CaCO 3 CaO + CO 2 5. Calculate the mass of sodium hydroxide you would need to neutralise a solution containing 7.3 g of hydrogen chloride. Reaction NaOH + HCl NaCl + H 2 O 6. Find how many grams of sodium sulphate are formed when 49 g of sulphuric acid are dissolved and neutralised by sodium hydroxide solution. Reaction 2NaOH + H 2 SO 4 Na 2 SO 4 + H 2 O 7. What mass of zinc chloride is formed when 13 g of zinc are completely converted into the chloride. Reaction Zn + Cl 2 ZnCl 2 8. Calculate the mass of potassium chloride formed when a solution containing 8.00 g sodium hydroxide is neutralised with hydrochloric acid. Reaction NaOH + HCl NaCl + H 2 O 9. Calculate how much sodium nitrate you need to give 126 g of nitric acid by the following reaction. Reaction NaNO 3 + H 2 SO 4 HNO 3 + NaHSO 4
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