Question 1
Determine the enthalpy change (ΔH) for the combustion reaction.
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Chemistry · Unit 1 · Chemical reactions — reactants, products and energy change · Chemical reactions
the enthalpy change of a reaction, e.g. calorimetry or Hess’s Law.
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Question 2
In a calorimetry experiment, 50 mL of 0.20 mol/L hydrochloric acid is mixed with 50 mL of 0.20 mol/L sodium hydroxide solution in an insulated cup. The temperature rises from 20 °C to 26 °C. Which statement about the enthalpy change for this reaction is correct?
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Question 3
When 2.50 g of calcium carbonate (CaCO₃) reacts with hydrochloric acid in an insulated container, the temperature of the solution increases from 22.0 °C to 28.5 °C. The mass of the solution is 150 g and its specific heat capacity is 4.18 J g⁻¹ K⁻¹. (a) Calculate the heat released by this reaction in joules. (b) Calculate the enthalpy change (ΔH) for the reaction per mole of CaCO₃, in kJ mol⁻¹.
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