Răspuns:
Explicație:
Zn+2HF=ZnF2+H2
n=m/A
m=n*A=16 moli*65 g/mol=1040 g
M HF=1+19 =20 g/mol
MZnF2=65+2*19=103 g/mol
65gZn......2*20 gHF......103 gZnF
1040 g...........x.................y
x= 640g HF
y=1648 g ZnF
c=md/ms*100
ms=md*100/c=640*100/5=12800 g HF