Question

What's the bond energy of covalent O-H bond in water?

Answer 1

Bond energy (BE), also called the mean bond enthalpy or average bond enthalpy, is the measure of bond strength during a bond. The larger the typical bond energy, per electron-pair bond, of a molecule, the more stable and lower-energy the molecule.

Complete answer:
Hydrogen bond is a weak electrostatic force of attraction (van der Waals attraction) between atoms and little sized, highly electronegative atoms. It's weaker than chemical bonds. O−H bond in water may be a chemical bond and its bond energy is bigger than that of chemical bond.
Bond energy is a quantity that gives insight into the strength of a bond.
• A weak electrostatic force of attraction exists between hydrogen atoms and little , highly electronegative atoms.
• It features a lower strength than a chemical bond.
The O-H bond in water may be a chemical bond with a better bond energy than the chemical bond.
• The bond energy of the covalent O-H bonds in water is reported to be the typical of the 2 values, or 458.9kJ/mol.
Therefore, the bond energy of the covalent O-H bonds in water is reported to be the typical of the 2 values, or 458.9 kJ/mol. These energy values (493 and 424 kJ/mol) required to interrupt successive O-H bonds within the water molecule are called 'bond dissociation energies,' and that they are different from the bond energy.

Note:
Bond-breaking is an endothermic process. Energy is released when new bonds form. Bond-making is an exothermic process. Whether a reaction is endothermic or exothermic depends on the difference between the energy needed to interrupt bonds and therefore the energy released when new bonds form.