Which of the following statements is correct:
Correct answer: C. The heat of neutralization of a strong acid with a strong base is always the same
- A. ΔH is positive for an exothermic reaction
- B. ΔH is negative for an endothermic reaction
- C. The heat of neutralization of a strong acid with a strong base is always the same
- D. The enthalpy of fusion is negative
Explanation
The neutralization of any strong acid with any strong base always involves the same net ionic reaction: H⁺(aq) + OH⁻(aq) → H₂O(l). Because the reaction is fundamentally the same, the enthalpy of neutralization is a nearly constant value (approx. -57.4 kJ/mol).
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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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