[tex]M_{Mn}=55g/mol[/tex]
[tex]N_{A}=6,023*10^{23}[/tex] atomi/molecule per mol de substanta
6,023*10^22 atomi = 0,6023*10^23 atomi Mn
6,023*10^23 atomi Mn..............55g Mn
0,6023*10^23 atomi Mn..........x g Mn
x = 0,6023*10^23*55/6,023*10^23 = 5,5g Mn
