2. Sulfur dioxide can be produced by heating sulfide ores such as iron(II) sulfide, FeS:, in oxygen 4FeS: (s) + 1102(g) 2FeO (s) + 850; (g) a) i) Calculate the number of moles in 2.1 tonnes of SO 1 tonne = 1 10 g (2 Marks) ii) Use your answer to part (a) to calculate the minimum mass of iron sulfide, FeS required to produce 176 tonnes of SO (3 Marks) b) Formic acid is a weak acid with a dissociation constant K, of 1.69 x 101 The K, relates the concentration of the H ions denoted [H] and the amount of acid dissolved denoted N by the equation ka- [H+) N-[H.] Given that there is 0.1 moles of formic acid dissolved, calculate the pH of the solution (5 Marks) [Total: 10 Marks]