Chọn B

\(19,1gam\) \(:\left\{{}\begin{matrix}Al\\Mg\\Zn\end{matrix}\right.\)\(\underrightarrow{+O_2}\)\(Y:25,5gam\)\(\underrightarrow{+HCl}\left\{{}\begin{matrix}AgCl_3\\MgCl_2\\ZnCl_2\end{matrix}\right.\)  + H2 : 0,3 mol

                                                                                               H2O

Áp dụng định luật bảo toàn khối lượng:

\(mO_2=25,5-19,1=6,4gam\) \(\Rightarrow nO_2=0,2\left(mol\right)\)

BTNT O : nH2O = 0,4mol

\(\rightarrow nHCl^-\left(tdOxi\right)=0,8\left(mol\right)\)

\(nH_2=0,3\left(mol\right)\rightarrow nCl^-\left(tdKl\right)=0,6\left(mol\right)\)

\(m_{muối}=19,1+\left(0,8+0,6\right).35,5=68,8\left(g\right)\)

Đáp án D.

Áp dụng định luật bảo toàn khối lượng

→ n C l - ( t d   o x i )   =   0 , 8   m o l

a) \(n_{AlCl_3}=\dfrac{6,675}{133,5}=0,05\left(mol\right)\)

PTHH: 2Al + 6HCl --> 2AlCl₃ + 3H₂

          0,05<-----------0,05---->0,075

=> \(\%Al=\dfrac{0,05.27}{14,15}.100\%=9,54\%\)

=> \(\%Cu=\dfrac{14,15-0,05.27}{14,15}.100\%=90,46\%\)

b) \(V_{H_2}=0,075.22,4=1,68\left(l\right)\)

c) \(n_{Cu}=\dfrac{14,15-0,05.27}{64}=0,2\left(mol\right)\)

PTHH: 4Al + 3O₂ --t^o--> 2Al₂O₃

          0,05->0,0375

           2Cu + O₂ --t^o--> 2CuO 

            0,2-->0,1

=> \(V_{O_2}=\left(0,1+0,0375\right).22,4=3,08\left(l\right)\)

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\\ m_{AlCl_3}=6,675\left(mol\right)\\ n_{AlCl_3}=\dfrac{6,675}{133,5}=0,05\left(mol\right)\\ \Rightarrow n_{Al}=n_{AlCl_3}=0,05\left(mol\right)\\ \Rightarrow m_A=0,05.27=1,35\left(g\right);m_{Cu}=14,15-1,35=12,8\left(g\right)\\ \%m_{Cu}=\dfrac{12,8}{14,15}.100\approx90,459\%\\ \Rightarrow\%m_{Al}\approx9,541\%\\ b,n_{Cu}=\dfrac{12,8}{64}=0,2\left(mol\right)\\ n_{H_2}=\dfrac{3}{2}.n_{Al}=\dfrac{3}{2}.0,05=0,075\left(mol\right)\\ \Rightarrow V=V_{H_2\left(đktc\right)}=0,075.22,4=1,68\left(l\right)\\ 4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\\ 2Cu+O_2\rightarrow\left(t^o\right)2CuO\\ n_{O_2}=\dfrac{3}{4}.n_{Al}+\dfrac{1}{2}.n_{Cu}=\dfrac{3}{4}.0,05+\dfrac{1}{2}.0,2=0,0875\left(mol\right)\)

\(\Rightarrow V_{O_2\left(đktc\right)}=0,0875.22,4=1,96\left(l\right)\)