Which of the following statement is correct:
Correct answer: C. The heat of neutralization of strong acid with strong base is always the same
- A. ΔH is positive for exothermic reaction
- B. ΔH is negative for endothermic reactions
- C. The heat of neutralization of strong acid with strong base is always the same
- D. The enthalpy of fusion is negative
Explanation
Enthalpy of neutralization is merely the heat of formation of liquid water from its ionic components. H˕(aq)+ Cl·(aq)+ Na ̘1(aq)+ OH̄(aq) ⇌+Na˕(aq)+ Cl·(aq)+H2Oⱷ The main reaction that takes place during neutralization is H˕(aq)+OH·(aq) ⇌ H2Oⱷ ΔHn= -57.4 kj.mol ̘1 Enthalpy of neutralization of any strong acid and strong base is approximately the same i.c-57.4 kJ mol ̘1
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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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