Zn +H2SO4--->ZnSO4+H2(1)
Zn+2HCl----.ZnCl2 +H2(2)
a) Ta co
n\(_{Zn}\frac{3,25}{65}=0,05\left(mol\right)\)
Theo pthh 1,2
n\(_{H2}=n_{Zn}=0,05\left(mol\right)\)
V\(_{H2\left(đktc\right)}=0,05.22,4=1,12\left(l\right)\)
b) Gọi n\(_{Zn}pt1=x\)
Gọi n\(_{Zn}pt2=y\)
=>x+y=0,05(*)
Mặt khác
m\(_{ZnSO4}=161x\)
m\(_{ZnCl2}=136y\)
=> 161x+136y=7,55(**)
Từ 1 và 2 ta có hệ pt
\(\left\{{}\begin{matrix}x+y=0,05\\161x+136y=7,55\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,03\\y=0,02\end{matrix}\right.\)
Theo pthh1
n\(_{H2SO4}=n_{Zn}=0,03\left(mol\right)\)
=>C\(_{M\left(H2SO4\right)}=\frac{0,03}{0,5}=0,06\left(M\right)\)
Theo pthh2
n\(_{HCl}=2n_{Zn}=0,02\left(mol\right)\)
C\(_{M\left(HCl\right)}=\frac{0,02}{0,5}=0,04\left(M\right)\)
Chúc bạn học tốt
