Which one of the following statements is correct for the standard enthalpy change of neutralization of a strong acid by a strong alkali in aqueous solution at 25°C?
Correct answer: C. The enthalpy change per mole of H2O formed is independent of the acid or alkali used as they are strong
- A. It is an endothermic process
- B. It can be represented as H3O+(aq)+ OH-(aq) → 2H2O(l)
- C. The enthalpy change per mole of H2O formed is independent of the acid or alkali used as they are strong
- D. Both B and C
Explanation
The correct answer is C. The standard enthalpy change of neutralization is approximately -57.4 kJmol-1 for the reaction of strong acids and strong bases, as both fully dissociate into ions, leading to consistent energy release per mole of water formed. Option A is incorrect because neutralization is exothermic, not endothermic. Option B is incorrect as it focuses on ion interaction rather than the overall neutralization process. Option D is incorrect as only Option C is correct.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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