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The sum of the atomic masses of all the atoms in a molecule, usually expressed in atomic mass units.
The sum of the atomic masses of all the atoms in a molecule, usually expressed in atomic mass units. For a small molecule such as hydrogen, H2, molecular weight will be a small number – two in this case. For a large organic or protein molecule it can run into the thousands or millions.
For a small molecule such as hydrogen, H2, molecular weight will be a small number – two in this case. For a large organic or protein molecule it can run into the thousands or millions.