\(n_{H_2}=\frac{3,92}{22,4}=0,175mol\)
a. PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
b. Đặt \(\hept{\begin{cases}x\left(mol\right)=n_{Mg}\\y\left(mol\right)=n_{Al}\end{cases}}\)
\(\rightarrow24x+27y=3,75\left(1\right)\)
Theo phương trình \(n_{Mg}+1,5n_{Al}=n_{H_2}=0,175\)
\(\rightarrow x+1,5y=0,175\left(2\right)\)
Từ (1) và (2) \(\rightarrow\hept{\begin{cases}x=0,1mol\\y=0,05mol\end{cases}}\)
\(\rightarrow m_{Mg}=0,1.24=2,4g\)
\(\rightarrow m_{Al}=3,75-2,4=1,35g\)
