Gvozdje
Submitted by medvedica on Sun, 05/17/2015 - 13:11

Forums:
uzorak od 10g legure u ciji sastav ulaze bakar i cink tretiran je viskom hloridne kisjeline pri tome je dobijeno 1,12dm3 vodonika.kakv je maseni procentni sastav ove legure
hvala
m(legure)=10g
m(legure)=10g
Cu+HCl---> X
Zn+2HCl-->ZnCl2 +H2
V(H2)=1,12dm3
n(H2)=1,12dm3/22,4 =0,05mol
n(Zn):n(H2)=1:1
n(Zn)=0,05mol
m(Zn)=0,05mol*65,39g/mol =3,269
m(Cu)=10g-3,27g=6,73g
w(Cu)=6,73/10=0,673 *100%=67,3%
w(Zn)=3,27/10=0,327*100%=32,7%