Both atomic and molecular masses are usually obtained relative to the mass of the isotope <sup>12</sup>C (carbon 12), which by definition is equal to 12. For example, the ...
the mass of a molecule that is equal to the sum of the masses of all the atoms
contained in the molecule. See
the mass of a molecule in grams per mole, the sum of the component atomic
masses; molecular weight. Examples.
Compounds have mass, and this is what we call the
www.thefreedictionary.com/relative molecular mass
(Chemistry) the sum of all the relative atomic
Is that one neutron,; or one proton; have an atomic
The sum of the atomic weights of all the atoms in a molecule. Also called relative
The ratio of the average