Bond energy is the energy needed to break a bond between two atoms. It helps us understand how stable a molecule is. When bond energies are higher, the bonds are stronger, which makes the molecule more stable.

Key Points:

1. Bond Energy Values:

   • Single bonds (like C–C): about 348 kJ/mol
   • Double bonds (like C=C): about 602 kJ/mol
   • Triple bonds (like C≡C): about 839 kJ/mol

2. Stability Implications:

   • A molecule with high bond energy is harder to break apart, meaning it’s more stable. For example, nitrogen (N≡N) has a bond energy of around 941 kJ/mol, which helps it stay stable in different situations.
   • On the other hand, weak bonds (like C–H: about 412 kJ/mol) can make a molecule react more quickly, which means it’s less stable.

3. Influence on Reactivity:

   • Molecules with weaker bonds tend to react more easily because they need less energy to break those bonds.
   • For example, hydrocarbons have weaker single C–C bonds, making them more likely to catch fire compared to alkynes, which have stronger triple bonds.

In short, bond energy is closely linked to how stable a molecule is. The higher the bond energy, the more stable the molecule is.