Răspuns:
Explicație:
a.
m= n . M
m= 500moli . 24g/moli = 12000 g Mg =12 Kg
1mol de atomi de Mg-------------6,022.10²³ atomi Mg
500moli-----------------------x
x= 500 .6,022.10²³ = 3011 . 10²³atomi Mg
b.
m= 3000moli . 39g/moli= 117000 g K = 117kg
1mol de atomi K-------------6,022.10²³atomi K
3000moli--------------------------------y
y= 3000 . 6,022 . 10²³ = 18066 . 10²³ atomi K