This channel is dedicated to students of chemistry, medicine, pharmacy, biology, physics, agriculture and other branches studying chemistry.Atomic mass unit definition is - a unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to 1/12 the mass of a single atom of the most abundant carbon isotope 12C —called also dalton.

There is one atom of sodium and one of chlorine. The proportions by weight are different. The weight (relative atomic mass) of sodium is 23 and of chlorine is 35.5. If we add these together we get the formula weight of a sodium chloride molecule: 23+35.5=58.5. In other words, at the atomic level, the appropriate unit for amount-specific mass ("molar" mass) is dalton per entity--and, because of the mole definition as an Avogadro number of entities, dalton per entity is exactly equal to the macroscopic units gram per mole or kilogram per kilomole.

Atomic mass of Sodium is 22.9897 u. The atomic mass is the mass of an atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element.

Solved: An atom of sodium has an atomic mass of 23 and an atomic number of 11. The atom contains how many protons, neutrons, and electrons? By... 3. ii) mass of 1 mole atom of any molecule is Relative Molecular Mass or Relative Formula Mass in 5. For example (element):Relative Atomic Mass of sodium (Na) = 23 g/mol So, the mass of 1 mole...

Molar Mass Definition, Unit, Mole, Mass vs Atomic Mass, Atomic Weight, Molar of Mixtures The molar mass of sodium chloride is known; it is 58.44 g mol−1. If we have to measure one mole of...The mass number. is given at the top left of the elements symbol, for example, sodium has a mass number of 23. We know that the atomic number of sodium is 11. This tells us that sodium has 11 ...