spuns:
Explicație:
a) Zn + 2HCl -> [tex]ZnCl_{2}[/tex] [tex]+H_{2}[/tex]
b) [tex]c=\frac{md*100}{ms}[/tex]
[tex]30=\frac{100md}{500}[/tex]
[tex]100md=15000[/tex]
[tex]md=15 g[/tex]
c) [tex]M_{Zn}=65 g/mol[/tex]
[tex]M_{HCl}=36.5 g/mol[/tex]
[tex]65 g Zn..............36.5gHCl[/tex]
[tex]15gZn.................xg HCl[/tex]
[tex]x=8.42 gHCl[/tex]
[tex]ms_{HCl}=\frac{842.30}{20}[/tex]
[tex]ms_{HCl}=42.11 g[/tex]