Chemistry Chemical Bonding UHS 2023
PMDC Verified Question 22 of 102
The bond energy of hydrogen in \( \text{H}_2 \) molecule is:
A
242 KJ/mol
B
431 KJ/mol
C
436 KJ/mol
D
346 KJ/mol
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 436 KJ/mol
Concept:

Bond dissociation energy is a specific thermodynamic value representing the strength of the bond between two atoms.

Formula:

$$ \text{H}_2(g) \longrightarrow 2\text{H}(g) \quad \Delta H = 436 \text{ kJ/mol} $$

Solution:

  • The standard bond enthalpy required to break the single covalent sigma bond between two Hydrogen atoms in one mole of \( \text{H}_2 \) gas is experimentally determined to be 436 kJ/mol.


  • This is a factual memory-based value from standard thermodynamic tables.


Why other options are incorrect:

  • Option A: 242 kJ/mol is the bond energy of \( \text{Cl}_2 \).
  • Option B: 431 kJ/mol is the bond energy of HCl.
  • Option D: 346 kJ/mol is the bond energy of a C-C single bond.

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