The Bond Energy of H-F is________?
Correct answer: B. 562kJ/mol
- A. 456kJ/mol
- B. 562kJ/mol
- C. 281kJ/mol
- D. None
Explanation
The H-F bond is very strong, with a bond dissociation energy of approximately 562 kJ/mol, so option b is the closest value. The likely mistake is 281 kJ/mol, which is roughly half the required energy and may arise from treating bond energy as though it referred to only part of a molecule.
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About Bond Energy
Bond energy is the energy needed to break one mole of a particular covalent bond in gaseous molecules, while bond formation releases energy. Reaction enthalpy is estimated by subtracting the total energy of bonds formed from bonds broken, with attention to average bond energies and their limitations for specific molecules.
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