Răspuns:
Explicație:
4 kg Na
n= m : M
n= 4000g : 23g/moli = 173,9 moli Na
1mol Na -----------------6,022.10 ²³atomi Na
173,9moli-----------------------x
x= 173,9 . 6,022.10²³ = 1047,22 .10 ²³atomi Na
6,5 kg Ca
n= 6500g : 40g/moli = 162,5 moli Ca
1mol Ca-----------6,022.10²³ atomi Ca
162,5moli----------------x
x= 162,5 . 6,022.10²³ = 978,575 .10²³ atomi Ca
5,4kg Al
n= 5400g : 27g/moli= 200moli Al
1mol Al--------------------6,022.10²³ atomi Al
200moli--------------------------x
x= 200 .6,022.10²³ = 1204,4 .10²³ atomi Al
