Answer: 436 kJ/mol.
- A 436 kJ/mol
- B 946 kJ/mol
- C 240 kJ/mol
- D 154 kJ/mol
Correct answer: A. 436 kJ/mol
Explanation: The H-H bond dissociation energy is about 436 kJ/mol, relatively strong for a single bond.
Each water molecule's O-H bonds (covalent, solid) can hydrogen-bond (dashed) to neighbouring molecules, forming an extended network responsible for water's unusually high boiling point and density anomaly.
Concept context
The simplest and most abundant element in the universe. Study its unique position in the periodic table, isotopes (protium, deuterium, tritium), properties of water and hydrogen peroxide, and industrial uses.