a, \(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
a______3a________________1,5a
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
b_____2b______________b
\(m_{Al,Zn}=2,76\left(g\right)\rightarrow27a+65b=2,76\left(1\right)\)
\(n_{H2}=\frac{1,68}{22,4}=0,075\left(mol\right)\rightarrow1,5a+7=0,075\left(2\right)\)
Giải hai phương trình (1) và (2)
\(\rightarrow\left\{{}\begin{matrix}a=0,03\\b=0,03\end{matrix}\right.\)
\(\rightarrow m_{Al}=0,03.27=0,81\left(g\right)\)
\(\rightarrow\%m_{Al}=\frac{0,81}{2,76}.100\%=29,35\%,\%m_{Zn}=100\%-29,35\%=70,65\%\)
b, \(n_{HCl}=3a+2b=0,15\left(mol\right)\)
\(\rightarrow m_{HCl}=0,15.36,5=5,475\left(g\right)\)
\(\rightarrow m_{DD_{HCl}}=\frac{5,475}{7,3}.100\%=75\left(g\right)\)
\(\rightarrow V_{HCl_{pu}}=\frac{75}{1,05}=71,43\left(l\right)\)