Among the following, for which reaction, heat of reaction represents bond energy of all:
Correct answer: A. HCl(g) ➞ H(g) + Cl(g)
- A. HCl(g) ➞ H(g) + Cl(g)
- B. HCl(g) ➞ 1/2 H2(g) + 1/2 Cl2(g)
- C. 2HCl(g) ➞ H2(g) + Cl2(g)
- D. HCl(g) ➞ H(g) + Cl-(g)
Explanation
The correct answer is Option A:HCl(g) ➞ H(g) + Cl(g). This reaction represents the breaking of the H-Cl bond to form individual hydrogen and chlorine atoms, which directly correlates to the bond energy of the H-Cl bond. In contrast, Option B involves the formation of diatomic molecules, which includes bond formation. Option C describes a reaction where new bonds are formed between hydrogen and chlorine atoms, and Option D involves the formation of ions, which includes additional energy considerations such as ionization energy and electron affinity.
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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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