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 calculated by adding the atomic masses of all the atoms present in a molecule according to their respective proportions.
Molecular mass is the sum of the atomic masses of all the atoms in a molecule of a substance, expressed in atomic mass units (u).
Crossover ensures that the total positive charge from cations balances the total negative charge from anions, resulting in a neutral compound according to the law of electrical neutrality.
We represent them by writing the symbols of the elements and their respective valencies. For example, Na^+ and Cl^- for sodium chloride (NaCl).