Răspuns:
Explicație:
n= m : M
MH2O= 2 + 16=18-----> 18g/moli
n= 3,6g : 18g/moli = 0,2 moli H2O
1mol H2O-----------6,022.10²³molecule H2O --------3 . 6,022.10²³atomi
0,2 moli ------------------------------------------------------------------x
x= 0,2 . 3 . 6,022.10²³atomi =3, 6132 .10²³atomi
