Răspuns:
Explicație:
3.
a.
masa 2 Al = 2 . 27 = 54-------> 54g/moli de atomi
b.
n= m : M
n= 12,4 kg : 31 kg/kmoli=0,4 kmoli= 400 moli fosfor
c.
32g S-------> 1mol S
n= 160g : 32g/moli= 5 moli S
1mol S ----------16 . 6,023.10²³ e
5moli S-----------------x e
x= 5 . 16 . 6,023.10²³ e= 481,84 .10²³ e
d.
1mol de atomi C---------6,023.10²³atomi C
3moli -------------------------------x
x= 3 . 6,023.10²³atomi C = 18 , 069 .10²³atomi C
