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

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

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

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

1////          nAl=0,4mol   

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

0,4mol      1,2mol         0,4mol    0,6 mol

a/ V_H2=0,6.22,4=13,44 l

b/ V=1,2/2=0,6 l

C_AlCl3=0,4/0,6=2/3 M

Câu 1
\(a)PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\ b)200ml=0,2l\\ n_{HCl}=0,2.1=0,2mol\\ n_{H_2}=n_{MgCl_2}=\dfrac{1}{2}n_{H_2}=\dfrac{1}{2}\cdot0,2=0,1mol\\ V_{H_2}=0,1.24,79=2,479l\\ c)C_{M_{MgCl_2}}=\dfrac{0,1}{0,2}=0,5M\)

Câu 2
\(a)PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\ b)n_{Mg}=\dfrac{1,2}{24}=0,05mol\\ n_{H_2}=n_{MgCl_2}=n_{Mg}=0,05mol\\ V_{H_2}=0,05.24,79=1,2395l\\ c)n_{HCl}=2n_{Mg}=2.0,05=0,1mol\\ V_{ddHCl}=\dfrac{0,1}{2}=0,05l\\ d)C_{M_{MgCl_2}}=\dfrac{0,05}{0,05}=1M\)

a)

$n_{MgO} = \dfrac{8}{40} = 0,2(mol)$
$MgO + 2HCl \to MgCl_2 + H_2O$

$n_{HCl} = 2n_{MgO} = 0,4(mol) \Rightarrow V_{dd\ HCl} = \dfrac{0,4}{1} = 0,4(lít)$

b)

$n_{MgCl_2} = n_{MgO} = 0,2(mol) \Rightarrow C_{M_{MgCl_2}} = \dfrac{0,2}{0,4} = 0,5M$

c)

$MgCl_2 + 2NaOH \to Mg(OH)_2 + 2NaCl$
$n_{NaOH} = 2n_{MgCl_2} = 0,4(mol)$
$n_{Mg(OH)_2} = n_{MgCl_2} = 0,2(mol)$
Suy ra : 

$V = \dfrac{0,4}{1} = 0,4(lít)$
$m_{Mg(OH)_2} = 0,2.58 = 11,6(gam)$

\(n_{MgO}=\dfrac{8}{40}=0,2mol\)

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

 0,2         0,4          0,2         0,2

a)\(V_{HCl}=\dfrac{0,4}{1}=0,4\left(l\right)=400ml\)

c) \(MgCl_2+2NaOH\rightarrow Mg\left(OH\right)_2+2NaCl\)

     0,2              0,2

   \(\Rightarrow V_{NaOH}=\dfrac{0,2}{1}=0,2\left(l\right)=200ml\)

a) $2NaOH + Cl_2 \to NaCl + NaCl + H_2O$

b) $n_{Cl_2} = \dfrac{6,5}{22,4} = 0,29(mol)$

$n_{NaOH} = 2n_{Cl_2} = 0,58(mol)$

$V_{dd\ NaOH} = \dfrac{0,58}{1} = 0,58(lít)$

$n_{NaCl} = n_{NaClO} = n_{Cl_2} = 0,29(mol)$
$C_{M_{NaCl}} = C_{M_{NaClO}} = \dfrac{0,29}{0,58} = 0,5M$

`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
\(V_{H_2}=0,15.22,4=3,36\left(l\right)\\ V_{HCl}=\dfrac{0,3}{2}=0,15\left(l\right)\\ C_{M\left(AlCl_3\right)}=\dfrac{0,1}{0,15}=\dfrac{2}{3}M\)

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

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

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

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

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

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

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?