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Răspuns:
H2+ Cl2==> 2HCl
1mol.......2mol
x,....................4mol
x= 2molCl2
M,Cl2= 71g/mol
m=niuxM=2x71g=142g Cl2
exces = 10x142/100g= 14,2g
m,total= 142g+14,2g= 156,2gCl2
Explicație: