Question

Cat aluminiu se consuma in procesul aluminotermic daca se obtin 11,2 g Fe ? Cat oxid de fier (III) intra in reactie ?

Answer 1

A,Fe= 56g/mol

A,Al= 27g/mol

M,Fe2O3=(2X56gFe +3x16gO)/mol=160g/mol

ecuatia reactiei chimice

2mol......1mol..........2mol

2Al   +   Fe2O3----> 2Fe  + Al2O3                  sau, in grame

2x27g.......160g.......2x56g

x...................y..............11,2g

x= 27x11,2/56 g Al=.......................calculeaza !!!

y= 160x11.2/2x56 gFe2O3=..........................CALCULEAZA !!!!