what is bond enthalpy
Answers
Required Answer:
☑When a bond is formed between atoms energy is released. When bonds dissociates energy required for dissociation. The energy released when a bond is formed or the energy required to dissociate the bonds is called Bond enthalpy.
Answer:
In chemistry, bond energy, also called the mean bond enthalpy or average bond enthalpy is the measure of bond strength in a chemical bond. IUPAC defines bond energy as the average value of the gas-phase bond-dissociation energy for all bonds of the same type within the same chemical species.
Explanation:
1). Formula
Bond energy is defined by the sum of all of the bonds broken minus the sum of all of the bonds formed: ΔH = ∑H(bonds broken) - ∑H(bonds formed).
2.)Increase
When a bond is strong, there is a higher bond energy because it takes more energy to break a strong bond. This correlates with bond order and bond length. When the Bond order is higher, bond length is shorter, and the shorter the bond length means a greater the Bond Energy because of increased electric attraction.
3.)Water
Therefore, the bond energy of the covalent O-H bonds in water is reported to be the average of the two values, or 458.9 kJ/mol. These energy values (493 and 424 kJ/mol) required to break successive O-H bonds in the water molecule are called 'bond dissociation energies,' and they are different from the bond energy.
4.) Types
Bond Energy
Type of bond or attraction. Range of bond
energies, kJ/mol
Ionic bonds. 700-4000
Covalent triple bonds 800-1000
Covalent double bonds 500-700
Covalent single bonds 200-500
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