Fe+2HCl->FeCl₂+H₂

0,125--0,25---0,125-0,125

m _HCl=9,125 g=>n _HCl=\(\dfrac{9,125}{26,5}\)=0,25 mol

=>m Fe=0,125.56=7g

=>V_H2=0,125.22,4=2,8l

=>C%_FeCl2=\(\dfrac{0,125.127}{7+182,5-0,25}\).100=8,388%

\(a) Fe + 2HCl \to FeCl_2\\ b) n_{HCl} = \dfrac{182,5.5\%}{36,5} = 0,25(mol)\\ n_{FeCl_2} = n_{H_2} = n_{Fe} = \dfrac{1}{2}n_{HCl} = 0,125(mol)\\ \Rightarrow m_{Fe} = 0,125.56 = 7(gam) ; V = 0,125.22,4 = 2,8(lít)\\ c) m_{dd\ sau\ phản\ ứng} = m_{Fe} + m_{dd\ HCl} - m_{H_2} = 7 + 182,5 - 0,125.2 = 189,25(gam)\\ C\%_{FeCl_2} = \dfrac{0,125.127}{189,25}.100\% = 8,39\%\)

Fe+2HCl->Fecl2+H2

0,15---0,3-----------0,15

n Fe=0,15 mol

=>VH2=0,15.22,4=3,36l

2H2+O2-to>2H2O

0,15---------------0,15

n O2=0,2 mol

=>O2 dư

=>m H2O=0,15.18=2,7g

\(n_{HCl}=\dfrac{25}{36,5}=\dfrac{50}{73}mol\)

2Al + 6HCl \(\rightarrow\) 2AlCl₃ + 3H₂

\(\Rightarrow n_{Al}=\dfrac{\dfrac{50}{73}.2}{6}=\dfrac{50}{219}mol\\ m_{Al}=\dfrac{50}{219}.27=\dfrac{450}{73}g\)

\(n_{H_2}=\dfrac{\dfrac{50}{73}.3}{6}=\dfrac{25}{73}mol\\ V_{H_2}=\dfrac{25}{73}.22,4=\dfrac{560}{73}l\)

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

b: \(n_{HCl}=\dfrac{25}{36.5}=\dfrac{50}{73}\left(mol\right)\)

\(\Leftrightarrow n_{AlCl_3}=\dfrac{150}{73}\left(mol\right)=n_{Al}\)

\(m_{Al}=\dfrac{150}{73}\cdot27=\dfrac{4050}{73}\left(g\right)\)

Theo gt ta có: $n_{Al}=0,1(mol)$

a, $2Al+6HCl\rightarrow 2AlCl_3+3H_2$

b, $\Rightarrow n_{H_2}=0,15(mol)\Rightarrow V_{H_2}=3,36(l)$

c, Ta có: $n_{HCl}=0,3(mol)\Rightarrow m_{HCl}=10,95(g)\Rightarrow \%m_{ddHCl}=219(g)$

d, Bảo toàn khối lượng ta có: $m_{dd}=221,4(g)$

$\Rightarrow \%C_{AlCl_3}=6,02\%$

a, \(MgO+H_2SO_4\rightarrow MgSO_4+H_2O\)

b, Ta có: \(m_{H_2SO_4}=200.9,8\%=19,6\left(g\right)\)

\(\Rightarrow n_{H_2SO_4}=\dfrac{19,6}{98}=0,2\left(mol\right)\)

Theo PT: \(n_{MgO}=n_{MgSO_4}=n_{H_2SO_4}=0,2\left(mol\right)\)

\(\Rightarrow m_{MgO}=0,2.40=8\left(g\right)\)

c, Ta có: m _{dd sau pư} = 8 + 200 = 208 (g)

\(\Rightarrow C\%_{MgSO_4}=\dfrac{0,2.120}{208}.100\%\approx11,54\%\)

1)

a) Fe + 2HCl --> FeCl₂ + H₂

b) \(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)

PTHH: Fe + 2HCl --> FeCl₂ + H₂

           0,15->0,3--->0,15-->0,15

=> V_H2 = 0,15.22,4 = 3,36 (l)

c) m_{dd sau pư} = 8,4 + 250 - 0,15.2 = 258,1 (g)

=> \(C\%_{FeCl_2}=\dfrac{0,15.127}{258,1}.100\%=7,38\%\)

2)

a) Zn + 2HCl --> ZnCl₂ + H₂

b) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)

PTHH: Zn + 2HCl --> ZnCl₂ + H₂

            0,2-->0,4---->0,2--->0,2

=> V_H2 = 0,2.22,4 = 4,48 (l)

m_ZnCl2 = 0,2.136 = 27,2 (g)

c) \(C_{M\left(dd.HCl\right)}=\dfrac{0,4}{0,2}=2M\)

d) 

PTHH: A + 2HCl --> ACl₂ + H₂

           0,2<--0,4

=> \(M_A=\dfrac{4,8}{0,2}=24\left(g/mol\right)\)

=> A là Mg(Magie)

a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

b, \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

Theo PT: \(n_{Zn}=n_{H_2}=0,3\left(mol\right)\)

\(\Rightarrow m_{Zn}=0,3.65=19,5\left(g\right)\)

c, \(n_{HCl}=2n_{H_2}=0,6\left(mol\right)\)

\(\Rightarrow C_{M_{HCl}}=\dfrac{0,6}{0,1}=6\left(M\right)\)

ⁿH₂ = 6,72 : 22,4 = 0,3 ( mol ) 

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

                0,2     0,6 mol <-    0,3mol

a = ^mAl = 0,2 x 27 = 5,4 (g)

^VHCl = 0,6 : 2 = 0,3 ( l ) = 300 ( ml )