-ecuatia reactiei este :
2mol 1mol 2mol 1mol
2Al + Fe2O3----> 2Fe + Al2O3
n=..........4mol..........n=
n,Al= 4x2/1= 8molAl
n,Fe= 4x2/1= 8molFe
A,Fe= 56g/mol--din tabel
1mol Fe are masa.....56g
8mol...........................m= 8x56g=......................calculeaza !!!