1. the atomic mass of the element does not have a unit.2. the atomic mass is the comparative value. The atomic mass of the element 1 part is the actual mass is g.3. standard atomic mass of the element 1 is the atomic mass differences of all the equal value for every element.4. the calculated from the formula, when informed that the atomic mass of the element 1 and calculated from the isotopes of the elements. Molecular massBecause the molecules are very small as well as the atom. The mass of the molecule, so it will be used to compare the popular saying.
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