Răspuns:
Explicație:
72g Mg
n= 72g : 24g/moli= 3 moli Mg
1mol Mg-----------6,022.10²³atomi Mg
3moli Mg----------------------x
x= 3 . 6,022.10²³=18,066 .10²³atomi Mg
1mol Al--------------------6,022.10²³atomi Al
6moli Al--------------------y
y= 6 . 6,022.10²³= 36,132 .10²³atomi Al
