The bond energy of (H2 )molecule (H2→2H) is:
Correct answer: A. 436Kj/mol
- A. 436Kj/mol
- B. 40.7 Kj/mol
- C. 272 Kj/mol
- D. 436÷Avagadros no Kj/mol
Explanation
Bond energy is the amount of energy required to break one mole of covalent bonds in a gaseous molecule, resulting in separate gaseous atoms. The bond energy of the H2 molecule can be determined experimentally by measuring the energy required to break the bond in the H2 molecule.The experimental value of the bond energy of H2 is approximately 436 kJ/mol.(It is a fact and should be memorized.)
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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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