Abnormal Molecular Masses

 Abnormal Molecular Masses:


When the observed molecular mass of a substance differs from its theoretical or expected value, it's referred to as abnormal molecular mass.


Causes:


1. Association: Molecules associate with each other, leading to higher observed molecular mass.

2. Dissociation: Molecules dissociate into smaller units, resulting in lower observed molecular mass.


Examples:


1. Acetic acid dimerization: Acetic acid molecules associate, leading to higher observed molecular mass.

2. Ionization of salts: Salts dissociate into ions, resulting in lower observed molecular mass.


Importance:


1. Understanding molecular behavior: Helps in understanding molecular interactions and behavior.

2. Colligative properties: Abnormal molecular masses affect colligative properties like boiling point elevation and freezing point depression.


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