Molar Mass of Oxygen | Oxygen is a Diatomic Molecule


When solving problems by the formula m = m/n for calculating the molar mass of oxygen, it is often necessary to determine what mass equals, or find out, the amount of substance. In the first case, the formula m = n.

m, in the second -n = m / m the numerical value of the molar mass of the element coincides with the mass of the atom, and for matter – molecules. For example, there is 1 mole of oxygen in a mass of 16 grams. M(O2) is the molar mass of the oxygen molecule, which is 32 g/mol.


Molar Mass of Oxygen 

At standard reference temperatures and pressures ( 0°C = 273.15 K, 32°F ) and (1 time) oxygen is in gaseous form and is composed of two atoms.

Its symbol is O2 and is blue in liquid and solid state, highly paramagnetic The molar mass of molecular oxygen M (O2) is equal to:


  •    M(o) + M(o) = M(o2)
  •    15.999 + 15.999 = 31.998 g/mol
  •    M(O) = molar mass of oxygen atom
  •    M (O2) = Molar mass of molecular oxygen 


Oxygen is a Diatomic Molecule

And in paramagnetics there are two electrons with the same spin. After the discovery of three oxygen isotopes, two atomic mass scales were defined:

UMA consists of one sixteenth of the mass obtained by averaging the masses of the three isotopes and physical scale with u.m.a. Sixteenth of the most abundant isotopes.

 Since 1960, the one referring to the most abundant isotope of carbon has been adopted as the international scale of atomic weight (12). So ‘um’ is equal to one twelfth of this carbon isotope whereas earlier it referred to the 16th part of an oxygen molecule.


Molar Mass of Oxygen Equivalent

Equivalent is the amount equal to the mass of 1 mole atom of any element monovalent. In general, the equivalent weight can be determined by dividing the molar mass of the chemical element’s atoms by its valency, specifically found by the formula of the compound. Most of its oxygen compounds, as a chemical element chalcogen, are divalent.

The molar mass of oxygen can be found on the periodic table, its rounded value – 16. The equivalent weight of at least 2 times – 8 Equivalent chemistry applicable law, which states that substances react together in equal amounts to their equivalent. When performing calculations one can use the equivalent molar mass of oxygen to determine the equivalent weight of the substance for which it is unknown.

Oxygen:- one of the most important elements of the Earth’s bark, accounts for 46.6% of the mass. A simple connection with the same name is the second most common in the Earth’s atmosphere.

The amount of molecular oxygen in the air is 20.9 47% by volume.  With the participation of atoms of elements and molecules of matter, many reactions and processes occur in engineering, industry, living and non-living nature.  It is important to note quantitative relationships in these processes, which greatly facilitate the use of physical quantities, including the molar mass of oxygen. 


Leave a Comment