Mg+2HCl---->MgCl2+H2
x----2x
2Al+6HCl--->2AlCl3+3H2
y-------3y
Ta có
n\(_{HCl}=0,4.2=0,8\left(mol\right)\)
Ta có hệ pt
\(\left\{{}\begin{matrix}24x+27y=7,8\\2x+3y=0,8\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,1\\y=0,2\end{matrix}\right.\)
Theo pthh1
n\(_{MgCl2}=n_{Mg}=0,1\)
m\(_{MgCl2}=0,1.95=9,5\left(g\right)\)
Theo pthh2
n AlCl3=n Al =0,2(mol)
m\(_{AlCl3}=0,2.133,5=26,7\left(g\right)\)
\(\text{Mg+2HCl-->MgCl2+H2}\)
\(\text{a----2a-------a}\)
\(\text{2Al+6HCl-->2AlCl3+3H2}\)
\(\text{b-----3b------b}\)
\(\Rightarrow\left\{{}\begin{matrix}\text{24a+27b=7,8}\\\text{2a+3b=0.8}\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}\text{a=0.1 }\\\text{b=0.2}\end{matrix}\right.\)
=>mMuoi=0,1.(24+71)+0,2.(27+35,5.3)=36,2
