2NaOH(0,2)+H2SO4(0,1)→Na2SO4+2H2O2NaOH(0,2)+H2SO4(0,1)→Na2SO4+2H2O

Fe(0,2)+H2SO4(0,2)→FeSO4+H2(0,2)Fe(0,2)+H2SO4(0,2)→FeSO4+H2(0,2)

nNaOH=840=0,2(mol)nNaOH=840=0,2(mol)

nFe=11,256=0,2(mol)nFe=11,256=0,2(mol)

⇒nH2SO4=0,1+0,2=0,3(mol)⇒nH2SO4=0,1+0,2=0,3(mol)

⇒mH2SO4=0,3.98=29,4(g)⇒mH2SO4=0,3.98=29,4(g)

b/ Thể tích H2 là: VH2=0,2.22,4=4,48(l)

a) PT: Fe+2HCl→FeCl₂+H₂   (1) 

- Số mol Fe là:

n_Fe=\(\dfrac{m}{M}\)=\(\dfrac{11,2}{56}\)=0,2(mol)

- Theo PT (1)⇒n_FeCl2=n_Fe=0,2(mol)

- Vậy khối lượng của FeCl₂ là:

m_FeCl2=n.M=0,2.127=25,4(g)

b) Theo PT (1)⇒n_H2=n_Fe=0,2(mol)

- Vậy thể tích của H₂ là:

V_H2=n.24,79=0,2.24,79=4,958(l)

`#3107.101107`

`a)`

\(\text{Fe + 2HCl}\rightarrow\text{FeCl}_2+\text{H}_2\)

n của Fe có trong phản ứng là:

\(\text{n}_{\text{Fe}}=\dfrac{\text{m}_{\text{Fe}}}{\text{M}_{\text{Fe}}}=\dfrac{11,2}{56}=0,2\left(\text{mol}\right)\)

Theo PT: \(\text{n}_{\text{Fe}}=\text{n}_{\text{ }\text{FeCl}_2}=0,2\left(\text{mol}\right)\)

m của FeCl₂ có trong phản ứng là:

\(\text{m}_{\text{FeCl}_2}=\text{n}_{\text{FeCl}_2}\cdot\text{M}_{\text{FeCl}_2}=0,2\cdot\left(56+35,5\cdot2\right)=25,4\left(\text{g}\right)\)

`b)`

Theo PT: \(\text{n}_{\text{Fe}}=\text{n}_{\text{H}_2}=0,2\left(\text{mol}\right)\)

V của khí H₂ ở đkc là:

\(\text{V}_{\text{H}_2}=\text{n}_{\text{H}_2}\cdot24,79=0,2\cdot24,79=4,958\left(\text{l}\right)\)`.`

\(4.a/n_{Al}=\dfrac{5,4}{27}=0,2mol\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

0,2       0,3                  0,1                  0,3

\(V_{H_2}=0,3.24,79=7,437l\\ b/C_{\%H_2SO_4}=\dfrac{0,3.98}{150}\cdot100=19,6\%\\ c/m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2g\)

\(5.a/n_{MgO}=\dfrac{4}{40}=0,1mol\\ MgO+2HCl\rightarrow MgCl_2+H_2O\)

0,1            0,2             0,1              0,1

\(C_{\%HCl}=\dfrac{0,2.36,5}{200}\cdot100=3,65\%\\ b/C_{\%MgCl_2}=\dfrac{0,1.95}{200+4}\cdot100=4,66\%\\ c/NaOH+HCl\rightarrow NaCl+H_2O\\ n_{NaOH}=n_{HCl}=0,2mol\\ V_{NaOH}=\dfrac{0,2}{1}=0,2l=200ml\)

\(4.\\ a/n_{Al}=\dfrac{5,4}{27}=0,2mol\\2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

\(0,2......0,3............0,1...............0,3\)

\(V_{H_2}=0,3.24,79=7,437l\\ b.C_{\%H_2SO_4}=\dfrac{0,3.98}{150}\cdot100=19,6\%\\ c.m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2g\)

\(7.\\a) n_{H_2SO_4}=\dfrac{100.9,8}{100.98}=0,1mol\\ ZnO+H_2SO_4\rightarrow ZnSO_4+H_2O\\ n_{ZnO}=n_{ZnSO_4}=n_{H_2SO_4}=0,1mol\\ m_{ZnO}=0,1.81=8,1g\\ b)C_{\%ZnSO_4}=\dfrac{0,1.161}{8,1+100}\cdot100=14,8\%\)

\(9.\\ a)n_{H_2}=\dfrac{2,479}{24,79}=0,1mol\\ Mg+2HCl\rightarrow MgCl_2+H_2\)

\(0,1.....0,2.........0,1........0,1\)

\(m_{Mg}=0,1.24=2,4g\\ m_{MgO}=8,4-2,4=6g\\ b)n_{MgO}=\dfrac{6}{40}=0,15mol\\ MgO+2HCl\rightarrow MgCl_2+H_2O\\ n_{HCl}=0,15.2+0,2=0,5mol\\ m_{ddHCl}=\dfrac{0,5.36,5}{3,65}\cdot100=500g\)

\(n_{H_2}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\)

PTHH: 2Al + 3H₂SO₄ ---> Al₂(SO₄)₃ + 3H₂

            2/15<-------------------1/15<----------0,2

             2H₂ + O₂ --t^o--> 2H₂O

              0,2-->0,1

\(m_{Al}=\dfrac{2}{15}.27=3,6\left(g\right)\\ m_{Al_2\left(SO_4\right)_3}=\dfrac{1}{15}.342=22,8\left(g\right)\\ V_{kk}=5.0,1.24,79=12,395\left(mol\right)\)

\(n_{H_2}=\dfrac{2,479}{24,79}=0,1mol\)

\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\)

0,1     0,05                       ( mol )

\(V_{O_2}=0,05.24,79=1,2395l\)

\(a.Mg+2HCl\rightarrow MgCl_2+H_2\\ b.n_{Mg}=\dfrac{4,8}{24}=0,2mol\\ Mg+2HCl\rightarrow MgCl_2+H_2\)

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

\(V_{H_2}=0,2.24,79=4,958l\\ c.m_{MgCl_2}=0,2.95=19g\\ d.C_{M_{HCl}}=\dfrac{0,4}{0,3}=\dfrac{4}{3}M\)

a, nMg=0,2(mol)

Mg+2HCl=>MgCl2+H2

b, nH2=nMg=0,2(mol)

=>VH2=4,958(l)

c,nMgCl2=nMg=0,2(mol)

=>mMgCl2=19(g)

d,nHCl=2nMg=0,4(mol)

=>cM(HCl)=0,75(M)

\(2NaOH\left(0,2\right)+H_2SO_4\left(0,1\right)\rightarrow Na_2SO_4+2H_2O\)

\(Fe\left(0,2\right)+H_2SO_4\left(0,2\right)\rightarrow FeSO_4+H_2\left(0,2\right)\)

\(n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\)

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

\(\Rightarrow n_{H_2SO_4}=0,1+0,2=0,3\left(mol\right)\)

\(\Rightarrow m_{H_2SO_4}=0,3.98=29,4\left(g\right)\)

b/ Thể tích H₂ là: \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)