a) PTHH: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)

X là khí Hidro

b) Ta có: \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\) \(\Rightarrow n_{Al}=0,2mol\) 

\(\Rightarrow\%m_{Al}=\dfrac{0,2\cdot27}{8,64}\cdot100\%=62,5\%\) \(\Rightarrow\%m_{Cu}=37,5\%\)

c) Theo PTHH: \(n_{HCl}=3n_{Al}=0,6mol\) 

\(\Rightarrow V_{HCl}=\dfrac{0,6}{1}=0,6\left(l\right)=600\left(ml\right)\)

a, \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)

Chất X là MgCl₂, Y là khí H₂

PTHH: Mg + 2HCl → MgCl₂ + H₂

Mol:     0,2       0,4        0,2        0,2

b, \(V=\dfrac{0,4}{2}=0,2\left(l\right)=200\left(ml\right)\)

  \(V_1=0,2.22,4=4,48\left(l\right)\)

c, \(C_{M_{ddMgCl_2}}=\dfrac{0,2}{0,2}=1M\)

d, 

PTHH: M₂O_x + 2xHCl → 2MCl_x + xH₂O

Mol:       \(\dfrac{0,2}{x}\)          0,4

\(\Rightarrow M_{M_2O_x}=\dfrac{16,2}{\dfrac{0,2}{x}}=81x\left(g/mol\right)\)

Vì M là kim loại nên có hóa trị l,ll,lll

⇒ M là kẽm (Zn)

a, \(Mg+2HCl\rightarrow MgCl_2+H_2\)

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

b, 24n_Mg + 27n_Al = 6,12 (1)

Theo PT: \(n_{H_2}=n_{Mg}+\dfrac{3}{2}n_{Al}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{Mg}=0,12\left(mol\right)\\n_{Al}=0,12\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{Mg}=\dfrac{0,12.24}{6,12}.100\%\approx47,06\%\\\%m_{Al}\approx52,94\%\end{matrix}\right.\)

\(\text{Đặt }\left\{{}\begin{matrix}n_{Al}=x\left(mol\right)\\n_{Fe}=y\left(mol\right)\end{matrix}\right.\\ n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\ a,PTHH:\left\{{}\begin{matrix}2Al+6HCl\rightarrow2AlCl_3+3H_2\\Fe+2HCl\rightarrow FeCl_2+H_2\end{matrix}\right.\\ b,\text{Theo đề ta có HPT: }\left\{{}\begin{matrix}27x+56y=8,3\\\dfrac{3}{2}x+y=0,25\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,1\left(mol\right)\\y=0,1\left(mol\right)\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}\%_{Al}=\dfrac{0,1\cdot27}{8,3}\approx32,53\%\\\%_{Fe}\approx67,47\%\end{matrix}\right.\)

\(c,\left\{{}\begin{matrix}n_{AlCl_3}=0,1\left(mol\right)\\n_{FeCl_2}=0,1\left(mol\right)\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}m_{AlCl_3}=0,1\cdot133,5=13,35\left(g\right)\\m_{FeCl_2}=0,1\cdot127=12,7\left(g\right)\end{matrix}\right.\\ \Rightarrow\sum m_{muối}=13,35+12,7=26,05\left(g\right)\)

a) Fe + 2HCl --> FeCl₂ + H₂

b) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: Fe + 2HCl --> FeCl₂ + H₂

_____0,15<-0,3<----0,15<---0,15

\(\left\{{}\begin{matrix}\%Fe=\dfrac{0,15.56}{12}.100\%=70\%\%\\\%Cu=100\%-70\%=30\%\end{matrix}\right.\)

c) m_HCl = 0,3.36,5 = 10,95 (g)

=> \(m_{dd}=\dfrac{10,95.100}{10}=109,5\left(g\right)\)

d) mdd  = 12 + 109,5 - 0,15.2 = 121,2 (g)

 \(C\%\left(FeCl_2\right)=\dfrac{0,15.127}{121,2}.100\%=15,718\%\)

a: \(Cu+2HCl->CuCl_2+H_2\)

\(Fe+2HCl->FeCl_2+H_2\)

\(n_{CaCO_3}=\dfrac{150}{100}=1.5\left(mol\right)\)

\(CaCO_3+2HCl\rightarrow CaCl_2+CO_2+H_2O\)

\(n_{CaCl_2}=n_{CO_2}=n_{CaCO_3}=1.5\left(mol\right)\)

\(V_{CO_2}=1.5\cdot22.4=33.6\left(l\right)\)

\(C_{M_{CaCl_2}}=\dfrac{1.5}{0.5}=3\left(M\right)\)