calculez moli acid clorhidric, cu M= 36,5g/mol
niu=m/M= 365g/36,5g/mol= 10mol HCl
-calculez moli si masa de clor, din ecuatia chimica
1mol 2mol
H2 + Cl2-----> 2HCl
x..................10
x=5mol Cl2
m=niuxM=5molx71g/mol=......................calculeaza !!!! (M,Cl2=2x35,5g/mol)