Un mol de oxigen are 32 de grame si contine Numarul lui Avogadro molecule
NA = 6.022 x 10 ²³ molecule/mol
O molecula de oxigen contine 2 atomi de oxigen.
O molecula are ( 32 g / NA molecule ) grame / molecula
5 atomi vor avea masa a 2,5 molecule adica 5/2 x 32/NA = 80 : 6,023 ²³ = 13.2824 x 10 ⁻²³ grame
