Răspuns:
in text ai 800g solutie HCl
Date necesare
M,Zn=65g/mol M,HCl= 36,5g/mol
Vm= 22,4L/mol
-calculez moliH2
niu=V/Vm= 89,6/22,4mol=4mol
-deduc masei HCl ,Zn din ecuatia chimica
65gl......2x36,5g..................1mol
Zn + 2HCl -----> ZnCl2 + H2
x........y.................................4mol
x= 260g Zn pur
y= 292gHCl
-calculez puritatea Zn
m ,p=260g
m,i=400g
p=m,px100/mi= 260x100/400=.........................calculeaza !!!!!
-calculez concentratia solutiei HCl
md=292g
ms=800g
c=mdx100/ms= 292x100/800 %=..........................calculeaza !!!!
Explicație: