What is the molecular mass of O2?

 Molecular mass is a measure of the mass of a molecule and is calculated by adding together the atomic masses of all of the atoms in the molecule. In the case of oxygen gas (O2), the molecular mass is calculated by adding the atomic mass of two oxygen atoms, which is 16.0 g/mol for each oxygen atom. The total molecular mass of O2 is therefore 2 x 16.0 g/mol = 32.0 g/mol.

It is important to note that the atomic mass of an element is the average mass of the atoms of that element, as measured in atomic mass units (amu). The atomic mass of an element is typically given in the periodic table of elements and is based on the relative abundance of the different isotopes of that element in nature. The atomic mass of an element can be used to calculate the molecular mass of a compound by adding together the atomic masses of all of the atoms in the compound.