Răspuns:
Explicație:
==>2 moli HCl
n= m : M
m=n .M
MHCl= 1+ 35,5=36,5------->36,5g/moli
m= 2moli . 36,5g/moli = 73 g HCl
==> n= 12g : 24g/moli=0,5 moli Mg
1mol de atomi de Mg----------6,023.10²³atomi Mg
0,5 moli de atomi Mg--------------------x
x= 0,5 . 6,023.10²³ atomi Mg =3,0115 .10²³atomi Mg
==> n = 18,06 .10²³ : 6,023 .10²³ =2,99 =3 moli Au
==>n = m : M
MH3PO4=3+31 + 4.16=98------>98g/moli
n= 490g ; 98g/moli=5 moli H3PO4
