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1. 20g of calcium is burned in excess oxygen, what is the mass of calcium oxide produced?
Ar [Ca = 40 O = 16]
2. A 0.8 M solution was diluted to a final volume of 500 mL. If the new concentration is 0.2 M then how much water was added to the original solution?
3. 90 grams of glucose is burned in a closed container which contains 80 grams of oxygen gas. Which of the following are true of this reaction?
Ar [H = 1 C = 12 O = 16]
I: Oxygen is the limiting reactant
II: There will be more carbon dioxide molecules produced than water molecules produced
III: There will be more oxygen molecules produced than glucose molecules produced
4. A 0.75 litre sodium chloride solution with concentration 0.5 M is diluted with water so that it now takes up 1.5 litres. What concentration would this solution have?
5. A container holds 0.5 moles of H₂ gas. How many hydrogen atoms are present in the container?
6. A mixture contains 60% NaCl. If we have 2.9 kg of the mixture, then how much sodium can be extracted?
[Ar: Na = 23 Cl = 35]
7. What mass of sulphur dioxide is required to make a 5 dL solution of concentration 4.0 mol/L?
[Ar: O = 16 S = 32]
8. A 100cm³ solution of HCl has a concentration of 0.5 M. What is the concentration if 300cm³ is added?