Question

cate grame fe2o3 rezulta la arderea a 112 g fier si cati moli de oxigen se consuma ?

Answer 1

-calculez moli Fe, cu M,Fe=56g/mol
n=m/M= 112g/56g/mol=2mol Fe

4mol.....3mol..........2mol
4Fe + 3 O2-------> 2Fe2O3
2mol......1,5mol........1mol

calculez masa de oxid, cu  M=160g/mol
m=nxM= 1molx160g/mol= 160g

moli O2:   n=1,5mol