Question

50. The bond dissociation energy of hydrogen bonds in water molecule is :

(1) 10.5 kJ/mol
(2) 20.5 kJ/mol
(3) 23.3 kJ/mol
(4) 230.3 kJ/mol

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Answer 1

The bond dissociation energy of hydrogen bonds in water molecule is 20.5 kJ/mol.

Explanation:

• Dissociation energy is an energy that requires to break down any chemical bond of a molecule.
• In a water molecule, there are two hydrogen molecules attached with Oxygen by sharing one-one electron to Oxygen molecule.
• To break down hydrogen bonds of water 20.5 kJ/mol is required for a water molecule.
• This represents bond dissociation energy of 20.5 kJ/mol concerning hydrogen in the water molecule.
• In normal hydrogen molecule, the bond dissociation energy of hydrogen is 10.5 kJ/mol but it is 20.5 kJ/mol for a water molecule.

To Know More:

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Answer 2

The bond dissociation energy of hydrogen bonds in water molecules is20.5 KJ/mol.

Option (2) is correct.

Explanation:

• Bond formation between oxygen and hydrogen atoms is due to the difference in their electronegativity values.
• All the water molecules are arranged in cluster form.
• There are some regions in water molecules forming large clusters and this leads to strong hydrogen bonding.
• Thus dissociation energy is the energy require to break the bond between hydrogen and oxygen.