a) When 2.76 g of potassium carbonate was added to 30.0 cm3 of approximately 2 mol dm hydrochloric acid, the temperature rose by 5.20 °C. -3 (i) Write an equation, including state symbols, for this reaction. (ii) Calculate the enthalpy change for this reaction per mole of potassium carbonate. Assume that the specific heat capacity and density of all solutions are 4.18 J g1K-1 and 1.00 g cm3 respectively. (iii) Explain why the hydrochloric acid need only be approximately 2 mol dm-3.

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