Răspuns:
MFe= 65g/mol
MFeCl3=65+3x35,5=171,5g/mol
2x65....................2x171,5g
2Fe + 3Cl2 → 2FeCl3
28g............................xg
x=28x2x171,5=calculeaza
calculam in moli
n=m/M=28/65=0,43moli
2moli.....................2moli
2Fe + 3Cl2 → 2FeCl3
0,43moli..................ymoli
y=0,43x2/2=calculeaza
Explicație: