Molecular mass is expressed in atomic mass units (u) because it represents the relative mass of a molecule based on the standard unit of atomic mass, which is the mass of a carbon-12 atom.
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Molecular mass is expressed in atomic mass units (u) because it represents the relative mass of a molecule based on the standard unit of atomic mass, which is the mass of a carbon-12 atom.
Molecular mass is expressed in atomic mass units (amu) because it represents the sum of the masses of all atoms within a molecule relative to the unified atomic mass unit. This allows for convenient comparison and calculation of relative masses in chemistry.