![]() We can determine the atomic mass easily via adding the masses of neutrons, protons and electrons of the atom. Moreover, there is a difference between atomic mass and molecular weight in the way we calculate these two quantities. As another significant difference between atomic mass and molecular weight, the unit of measurement of atomic mass is amu while the unit for molecular weight is g/mol. However, the key difference between atomic mass and molecular weight is that the atomic mass is the mass of a single atom whereas the molecular weight is the sum of the weights of the atoms in the molecule. What is the Difference Between Atomic Mass and Molecular Weight?Ītomic mass gives the mass of atoms while molecular weight gives the mass of molecules. Since their neutron amount is different, each isotope has a different atomic mass. Isotopes differ from each other by having a different number of neutrons, even though they have the same proton and electron amount. Most of the atoms in the periodic table have two or more isotopes. Therefore, we can say that the electrons’ contribution to an atomic mass is less. However, the mass of an electron is considerably very small compared to the masses of protons and neutrons. We take the mass at its rest because, according to the fundamentals of physics, when atoms are moving at very high velocity, the masses increase. In other words, it is the collection of masses of all the neutrons, protons and electrons in a single atom, specifically, when the atom is not moving (rest mass). Atomic mass is simply the mass of an atom. Side by Side Comparison – Atomic Mass vs Molecular Weight in Tabular FormĪtoms mainly contain protons, neutrons and electrons. ![]() These are important in determining the molecular weight. ![]() Molecular structures give the exact ratios of atoms thus, we can write molecular formulas for compounds. Atoms can join in various combinations, to form molecules and other compounds. The key difference between atomic mass and molecular weight is that the atomic mass is the mass of a single atom whereas the molecular weight is the sum of the weights of the atoms in the molecule.Ītoms are the building blocks of all matter.
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