pứ: Fe + 2HCl -> FeCl₂ + H₂

b. n_Fe = \(\dfrac{5,6}{56}\)= 0,1 mol

Từ pt suy ra được: n_HCl = 2.n_Fe= 0,2 mol

=> m_HCl = 0,2. 36,5 = 7,3 g

c. n_H2 = n_Fe = 0,1 mol

=> V_H2 = 0,1.22,4 = 2,24 (lít)

Fe+2Hcl->FeCl2+H2

0,1---------------------0,1

2H2+O2-to>2H2O

0,1--------------0,1

n Fe=0,1 mol

=>VH2=0,1.22,4=2,24l

c) m H2O=0,1.18.95%=1,71g

\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)

PTHH: 

Fe + 2HCl ---> FeCl₂ + H₂

0,1                                0,1

2H₂ + O₂ --to--> 2H₂O

0,1                       0,1

\(\rightarrow\left\{{}\begin{matrix}V_{H_2}=0,1.22,4=2,24\left(l\right)\\m_{H_2O}=0,1.18.\left(100\%-5\%\right)=1,71\left(g\right)\end{matrix}\right.\)

nFe = 5,6 : 56 = 0,1 (mol) 
pthh : Fe + 2HCl -> FeCl2 + H2 
         0,1                               0,1 
=> V_H2 = 0,1 . 22,4 = 2,24 (l)
PTHH :  2H2O -đp--> 2H2 + O2 
             0,1                 0,1 
nH2O(tt) = 95% nH2O(lt)
              => nH2O(tt) = 95% . 0,1 = 0,097(mol) 
=>mH2O  = 0,097 . 18 = 1,746 (G)

a, nFe = 11,2/56 = 0,2 (mol)

b, PTHH: Fe + 2HCl -> FeCl2 + H2

Mol: 0,2 ---> 0,4 ---> 0,2 ---> 0,2

mFeCl2 = 0,2 . 127 = 25,4 (g)

c, VH2 = 0,2 . 22,4 = 4,48 (l)

d, CMddHCl = 0,4/0,4 = 1M

\(n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ 0,03....0,06.....0,03.......0,03\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,03.22,4=0,672\left(l\right)\\ b,m_{HCl}=0,06.36,5=2,19\left(g\right)\\ c,m_{FeCl_2}=127.0,03=3,81\left(g\right)\)

\(n_{Fe}=\dfrac{1.4}{56}=0.025\left(mol\right)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(0.025.....0.05...............0.025\)

\(m_{HCl}=0.05\cdot36.5=1.825\left(g\right)\)

\(V_{H_2}=0.025\cdot22.4=0.56\left(l\right)\)

\(Fe + 2HCl \to FeCl_2 + H_2\\ n_{Fe} = n_{FeCl_2} = n_{H_2} = \dfrac{8,96}{22,4} = 0,4(mol)\\ m_{Fe} = 0,4.56 = 22,4(gam)\\ m_{FeCl_2} = 0,4.127 = 50,8(gam)\)

\(n_{H_2}=\dfrac{8.96}{22.4}=0.4\left(mol\right)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(n_{Fe}=n_{FeCl_2}=n_{H_2}=0.4\left(mol\right)\)

\(m_{Fe}=0.4\cdot56=22.4\left(g\right)\)

\(m_{FeCl_2}=0.4\cdot127=50.8\left(g\right)\)

a) PTHH : Fe + 2HCl → FeCl₂ + H₂

b) V_H2(đktc)=8,96(l) → n_H2= \(\dfrac{8,96}{22,4}\)=0,4(mol)

→ n_Fe= 0,4(mol)

m_Fe= 0,4 . 56=22,4(g)

c) Ta có :  n_H2= \(\dfrac{8,96}{22,4}\)=0,4(mol) → n_FeCl2= 0,4(mol)

m_FeCl2= 0,4 . 127=50,8(g)

Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)

PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)

____0,1______0,2_____0,1____0,1 (mol)

a, \(C_{M_{HCl}}=\dfrac{0,2}{0,15}=\dfrac{4}{3}\left(M\right)\)

\(V_{H_2}=0,1.22,4=2,24\left(l\right)\)

b, \(FeCl_2+2NaOH\rightarrow2NaCl+Fe\left(OH\right)_2\)

Theo PT: \(n_{NaOH}=2n_{FeCl_2}=0,2\left(mol\right)\)

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

\(a,n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\)

\(PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ \Rightarrow n_{H_2}=n_{Fe}=0,03\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,03\cdot22,4=0,672\left(l\right)\\ b,n_{HCl}=2n_{Fe}=0,06\left(mol\right)\\ \Rightarrow m_{HCl}=0,06\cdot36,5=2,19\left(g\right)\\ c,n_{FeCl_2}=n_{Fe}=0,03\left(mol\right)\\ \Rightarrow m_{FeCl_2}=0,03\cdot127=3,81\left(g\right)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\\ a.n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\\ n_{H_2}=n_{Fe}=0,03\left(mol\right)\\ \Rightarrow V_{H_2}=0,03.22,4=0,672\left(l\right)\\ b.n_{HCl}=2n_{Fe}=0,06\left(mol\right)\\ m_{HCl}=0,06.36,5=2,19\left(g\right)\\ c.n_{FeCl_2}=n_{Fe}=0,03\left(mol\right)\\ m_{FeCl_2}=0,03.127=3,81\left(g\right)\)

\(n_{HCl}=0,5.0,2=0,1\left(mol\right)\)

Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2\)

      0,05<--0,1----->0,05--->0,05

\(m_{Fe}=0,05.56=2,8\left(g\right)\)

\(m_{FeCl2}=0,05.127=6,35\left(g\right)\)

\(V_{H2\left(dktc\right)}=0,05.22,4=1,12\left(l\right)\)

\(V_{H2\left(dkc\right)}=0,05.24,79=1,2395\left(l\right)\)