\(Fe_2O_3=\dfrac{24}{160}=0,15\left(mol\right)\\ PTHH:Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\\ n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,15\left(mol\right)\\ a,m_{Fe_2\left(SO_4\right)_3}=400.0,15=60\left(g\right)\\ b,n_{H_2SO_4}=3n_{Fe_2O_3}=3.0,15=0,45\left(mol\right)\\ C_{MddH_2SO_4}=\dfrac{0,45}{0,2}=2,25\left(M\right)\\ c,V_{ddsau}=V_{ddH_2SO_4}=0,2\left(l\right)\\ C_{MddFe_2\left(SO_4\right)_3}=\dfrac{0,15}{0,2}=0,75\left(M\right)\)

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

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

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

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

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

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

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

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

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

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

\(n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\)

Pt : \(Mg+H_2SO_4\rightarrow MgSO_4+H_2|\)

         1           1                1            1

         0,3       0,3                            0,3

a) \(n_{H2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)

\(V_{H2\left(dktc\right)}=0,3.22,4=6,72\left(l\right)\)

b) \(n_{H2SO4}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)

\(m_{H2SO4}=0,3.98=29,4\left(g\right)\)

\(m_{ddH2SO4}=\dfrac{29,4.100}{9,8}=300\left(g\right)\)

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B

\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)

PTHH: Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O

Mol:       0,1                               0,1

\(m_{Fe_2\left(SO_4\right)_3}=0,1.400=40\left(g\right)\)

\(a.n_{Fe}=\dfrac{8,4}{56}=0,15mol\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=n_{FeCl_2}=0,15mol\\ V_{H_2,đktc}=0,15.22,4=3,36l\\ V_{H_2,đkc}=0,15.24,79=3,7185l\\ b.n_{HCl}=0,15.2=0,3mol\\ C_{M_{HCl}}=\dfrac{0,3}{0,2}=1,5M\\ c.m_{FeCl_2}=0,15.127=19,05g\)

\(n_{Fe2O3}=\dfrac{8}{160}=0,05\left(mol\right)\)

a) Pt : \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2|\)

                1              3                    1              3

               0,05        0,15               0,05

b) \(n_{Fe2\left(SO4\right)3}=\dfrac{0,05.1}{1}=0,05\left(mol\right)\)

⇒ \(m_{Fe2\left(SO4\right)3}=0,05.400=20\left(g\right)\)

c) \(n_{H2SO4}=\dfrac{0,05.3}{1}=01,5\left(mol\right)\)

\(V_{ddH2SO4}=\dfrac{0,15}{2}=0,075\left(M\right)\)

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