Question

Calculati numarul de elctroni de Co continut in 265,5g cobalt,pote cineva sa imi spuna cum se face?

Answer 1

Co are Z(numar de ordine= nr.electroni)= 27---> 1atom are 27 e

1mol Co are masa atomica molara A=59g/mol

deci 59g     contin  6,023x10²³ atomi(numarul lui Avogadro )

   265,5g..................................N= 27X10²³atomi

1atom............27 e

27x10²³at.........x=732x10²³ e