Răspuns:
M,Al= 27g/mol
M,H2=2g/mol
niu,Al=m/M=1080g/27g/mol=40mol
2mol..............................................3mol
2Al+3H2SO4---> Al2(SO4)3 +3H2
40mol................................................x=
x=niu=60mol H2
m,H2= niuxM= 60molx2g/mol=120g
Explicație: