PTHH: \(MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2\)

Ta có: \(n_{HCl}=0,2\cdot0,5=0,1\left(mol\right)\) \(\Rightarrow n_{MgCl_2}=0,05mol\)

\(\Rightarrow C_{M_{MgCl_2}}=\dfrac{0,05}{0,5}=0,1\left(M\right)\) (Coi như V_dd thay đổi không đáng kể)

\(n_{Al}=\dfrac{4.5}{27}=\dfrac{1}{6}\left(mol\right)\)

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

\(\dfrac{1}{6}.....0.5.......\dfrac{1}{6}.......0.25\)

\(m_{HCl}=0.5\cdot36.5=18.25\left(g\right)\)

\(m_{AlCl_3}=\dfrac{1}{6}\cdot133.5=22.25\left(g\right)\)

\(V_{H_2}=0.25\cdot22.4=5.6\left(l\right)\)

Yêu cầu của đề là gì vậy em ?

nAl=1/6(mol)

PTHH: 2 Al + 6 HCl -> 2 AlCl3 + 3 H2

1/6________1/2(mol)

Ủa đề cứ thiếu thiếu , bắt tính gì làm gì em?

`n_[Al]=[2,7]/27=0,1(mol)`

`2Al + 6HCl -> 2AlCl_3 + 3H_2 \uparrow`

`0,1`    `0,3`              `0,1`      `0,15`           `(mol)`

`a)V_[H_2]=0,15.22,4=3,36(l)`

`b)V_[dd HCl]=[0,3]/2=0,15(l)`

`=>C_[M_[AlCl_3]]=[0,1]/[0,15]~~0,67(M)`

\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\ pthh:2Al+6HCl\rightarrow2AlCl_3+3H_2\) 
          0,1        0,3            0,1            0,15
\(V_{H_2}=0,15.22,4=3,36\left(l\right)\\ V_{HCl}=\dfrac{0,3}{2}=0,15\left(l\right)\\ C_{M\left(AlCl_3\right)}=\dfrac{0,1}{0,15}=\dfrac{2}{3}M\)

a) \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

PTHH: Mg + 2HCl --> MgCl₂ + H₂

_____0,1<-0,2------<0,1<---0,1

=> m_MgCl2 = 0,1.95 = 9,5 (g)

b) \(C_{M\left(HCl\right)}=\dfrac{0,2}{0,2}=1M\)

\(a)n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\\ 2Al+6HCl\xrightarrow[]{}2AlCl_3+3H_2\\ n_{H_2}=\dfrac{3}{2}n_{Al}=\dfrac{3}{2}\cdot0,4=0,6\left(mol\right)\\ V_{H_2}=0,6.22,4=13,44\left(l\right)\\ b)n_{HCl}=3n_{Al}=3.0,4=1,2\left(mol\right)\\ m_{HCl}=1,2.36,5=43,8\left(g\right)\\ m_{dd_{HCl}}=\dfrac{43,8}{10,95\%}\cdot100\%=400\left(g\right)\\ c)n_{AlCl_3}=n_{Al}=0,4mol\\ m_{AlCl_3}=0,4.133,5=53,4\left(g\right)\\ m_{H_2}=0,6.2=1,2\left(g\right)\\ m_{dd_{AlCl_3}}=10,8+400-1,2=409,6\left(g\right)\\ C_{\%AlCl_3}=\dfrac{53,4}{409,6}\cdot100\%\approx13\%\)

\(a.n_{Mg\left(OH\right)_2}=\dfrac{17,4}{58}=0,3\left(mol\right)\\ Mg\left(OH\right)_2+2HCl\rightarrow MgCl_2+2H_2O\\ n_{HCl}=2n_{Mg\left(OH\right)_2}=0,6\left(mol\right)\\ CM_{HCl}=\dfrac{0,6}{0,2}=3M\\b. n_{Mg\left(OH\right)_2}=n_{MgCl_2}=0,3\left(mol\right)\\ m_{MgCl_2}=0,3.85=25,5\left(g\right)\\c.CM_{MgCl_2}=\dfrac{0,3}{0,2}=1,5M \)

\(n_{Mg}=\dfrac{9,6}{24}=0,4\left(mol\right)\)

Pt : \(Mg+2HCl\rightarrow MgCl_2+H_2|\)

        1           2              1           1

      0,4         0,8           0,4

\(n_{HCl}=\dfrac{0,4.2}{1}=0,8\left(mol\right)\)

\(V_{ddHCl}=\dfrac{0,8}{0,5}=1,6\left(l\right)\)

\(n_{MgCl2}=\dfrac{0,8.1}{2}=0,4\left(mol\right)\)

\(C_{M_{MgCl2}}=\dfrac{0,4}{1,6}=0,25\left(M\right)\)

 Chúc bạn học tốt

\(n_{Mg}=\dfrac{9,6}{24}=0,4\left(mol\right)\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ 0,4.......0,8.......0,4......0,4\left(mol\right)\\ V_{ddHCl}=\dfrac{0,8}{0,5}=1,6\left(l\right)\\ V_{ddMgCl_2}=V_{ddHCl}=1,6\left(l\right)\\ \Rightarrow C_{MddMgCl_2}=\dfrac{0,4}{1,6}=0,25\left(M\right)\)

\(a.MgO+2HCl\rightarrow MgCl_2+H_2O\)

\(b.n_{MgO}=\dfrac{16}{40}=0,04mol\)

\(\rightarrow n_{HCl}=0,04.2=0,08mol\)

\(C_{M_{HCl}}=\dfrac{0,08}{0,15}=0,53M\)

\(c.m_{MgCl_2}=0,04.95=3,8g\)