1. For the following reaction
Fe2O3 + 3 H2 -> 2 Fe + 3 H2O
If 6.3 g of Fe2O3 is reacted with 15.8 g of hydrogen to form iron and water. How many moles of the excess reagent are left over?
(The molar masses are: Fe = 55.8 g mol-1; H = 1.0 g mol-1; O = 16 g mol-1.)
2. You are asked to prepare 150 mL of a 0.059 M solution of silver nitrate. How many grams of silver nitrate do you need to weigh out? The molar mass of Ag is 108 g mol-1, N is 14 g mol-1, O is 16 g mol-1.
3. 28.4 mL of a 0.05 M sulfuric acid (H2SO4) solution are required to neutralise 25 mL of a sodium hydroxide (NaOH) solution.
What is the concentration (in mol L-1) of SO42- ions in the sulfuric acid solution?
4. 49.2 mL of a 0.05 M sulfuric acid (H2SO4) solution are required to neutralise 25 mL of a sodium hydroxide (NaOH) solution.
What is the concentration (in mol L-1) of the sodium hydroxide solution?
5.21.7 mL of a 0.05 M sulfuric acid (H2SO4) solution are required to neutralise 25 mL of a sodium hydroxide (NaOH) solution.
What is the concentration (in mol L-1) of SO42- ions in the final solution?