What would be approx. energy released on breaking H- H covalent bond

(1) 4.32 x 10⁵ J/mol
(2) 1 x 10^-19 J/mol
(3) 5 x 10^-19 J/mol
(4) 8 x 10¹⁹ J/mol

Energy Released on Breaking the H-H Covalent Bond

Understanding Bond Dissociation Energy

The bond dissociation energy (BDE) refers to the energy required to break a covalent bond between two atoms in a molecule. It is an essential factor in determining the strength and stability of a bond. The stronger the bond, the higher the energy required to break it.

The Energy of the H-H Bond

The H-H bond in molecular hydrogen (H₂) is one of the strongest single bonds due to its small atomic radius and high orbital overlap. The bond dissociation energy for H-H is approximately 432 kJ/mol (or 4.32 × 10⁵ J/mol).

Analyzing the Given Options

The possible answers are:

4.32 × 10⁵ J/mol ✅ (Correct Answer)
- This matches the experimentally determined bond dissociation energy of H-H.
1 × 10⁻¹⁹ J/mol ❌
- This value is extremely small and incorrect.
5 × 10⁻¹⁹ J/mol ❌
- Incorrect, as it does not match known BDE values.
8 × 10¹⁹ J/mol ❌
- This is an unrealistically high value.

Importance of Bond Energy in Chemical Reactions

Bond dissociation energy plays a crucial role in chemical kinetics and thermodynamics. It determines the stability of molecules and influences reaction rates, activation energy, and overall energy changes in chemical reactions. For example:

The combustion of hydrogen releases a significant amount of energy due to the strong H-H bonds breaking and forming stable H₂O molecules.
The hydrogenation process in organic chemistry relies on breaking and forming hydrogen bonds to modify molecular structures.

Suraj Sir: The God of Life Science

Suraj Sir, the founder of Let’s Talk Academy, is renowned as the God of Life Science for his exceptional teaching in CSIR NET Life Science. His expertise in chemical bonding, molecular interactions, and reaction mechanisms has helped numerous students achieve success.

For expert coaching in chemistry, biology, and life sciences, visit Let’s Talk Academy and learn directly from Suraj Sir.

Stay connected for more insights into bond energy, molecular interactions, and competitive exam preparation!