Molecular weight, also known as molecular mass, is a mass of a molecule of a substance. The sum of the atomic masses of all atoms in a molecule, based on a scale on which the atomic masses of hydrogen, carbon, nitrogen, and oxygen are 1, 12, 14, and 16. We can determine the mass of one carbon dioxide molecule by adding together the masses of 1 atom of carbon and two atoms of oxygen. The molecular mass of a compound is the mass of one molecule of that compound. The molecular mass of carbon dioxide is 44.01amu. Instead of creating the experiment diagram from scratch, try using EdrawMax's predefined templates to insert chemistry laboratory equipment as per the need.