Răspuns:
Explicație:
214,5 g Zn , p= 90%
react. cu o sol .HCl , c=10%
masa de HCl cons.
g,moli ZnCl2
=se afla masa pura de Zn
mp = p . mi : 100
mp= 90 . 214,5 : 100= 193, 05 g Zn pur
193,05 g xg yg
Zn + 2HCl = ZnCl2 + H2
65g 2.36,5g 136g
x= 193,05 . 73 : 65 =216,81 g HCl------> md sol. de HCl
ms= md .100 : c
ms= 216,81 .100 : 10 = 2168,1 g sol. HCl
y= 193,05 . 136 : 65 =403,92 g ZnCl2
n= 403, 92g : 136g/moli=2,97 moli ZnCl2
M HCl= 1 + 35,5= 36,5------> 36,5g/moli
MZnCl2= 65 + 2.35,5= 136------> 136g/moli