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Ta có: \(n_{Fe_2O_3}=\dfrac{9,6}{160}=0,06\left(mol\right)\)
a. PTHH: Fe2O3 + 3H2SO4 ---> Fe2(SO4)3 + 3H2O (1)
Theo PT(1): \(n_{H_2SO_4}=3.n_{Fe_2O_3}=3.0,06=0,18\left(mol\right)\)
=> \(m_{H_2SO_4}=0,18.98=17,64\left(g\right)\)
Ta có: \(C_{\%_{H_2SO_4}}=\dfrac{17,64}{m_{dd_{H_2SO_4}}}.100\%=9,8\%\)
=> \(m_{dd_{H_2SO_4}}=180\left(g\right)\)
b. Ta có: \(m_{dd_{Fe_2\left(SO_4\right)_3}}=9,6+180=189,6\left(g\right)\)
Theo PT(1): \(n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,06\left(mol\right)\)
=> \(m_{Fe_2\left(SO_4\right)_3}=0,06.400=24\left(g\right)\)
=> \(C_{\%_{Fe_2\left(SO_4\right)_3}}=\dfrac{24}{189,6}.100\%=12,66\%\)
c. PTHH: Fe2(SO4)3 + 3BaCl2 ---> 3BaSO4↓ + 2FeCl3 (2)
Theo PT(2): \(n_{BaSO_4}=3.n_{Fe_2\left(SO_4\right)_3}=3.0,06=0,18\left(mol\right)\)
=> \(m_{BaSO_4}=0,18.233=41,94\left(g\right)\)
Theo PT(2): \(n_{BaCl_2}=n_{BaSO_4}=0,18\left(mol\right)\)
=> \(m_{BaCl_2}=0,18.208=37,44\left(g\right)\)
Ta có: \(C_{\%_{BaCl_2}}=\dfrac{37,44}{m_{dd_{BaCl_2}}}.100\%=10,4\%\)
=> \(m_{dd_{BaCl_2}}=360\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)
PTHH: Fe2O3 + 3H2SO4 --> Fe2(SO4)3 + 3H2O
______0,05------>0,15--------->0,05
=> mH2SO4 = 0,15.98 = 14,7(g)
=> \(C\%\left(H_2SO_4\right)=\dfrac{14,7}{100}.100\%=14,7\%\)
\(C\%\left(Fe_2\left(SO_4\right)_3\right)=\dfrac{0,05.400}{8+100}.100\%=18,52\%\)
PTHH: Fe2(SO4)3 + 6NaOH --> 2Fe(OH)3\(\downarrow\) + 3Na2SO4
________0,05----------------------->0,1
=> mFe(OH)3 = 0,1.107=10,7(g)
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2......0.4........0.2.............0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(m_{FeCl_2}=0.2\cdot127=25.4\left(g\right)\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
Câu c và câu d không liên quan tới dữ liệu đề bài cho !
\(n_{HCl}=0,2.0,5=0,1(mol)\\ a,Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{Fe}=n_{FeCl_2}=\dfrac{1}{2}n_{HCl}=0,05(mol)\\ b,m_{Fe}=0,05.56=2,8(g)\\ c,m_{FeCl_2}=0,05.127=6,35(g)\)
a) \(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
b) \(n_{Fe_2O_3}=\dfrac{64}{160}=0,4\left(mol\right)\)
Theo PTHH: \(n_{Fe_2\left(SO_4\right)_3}=n_{Fe_2O_3}=0,4\left(mol\right)\Rightarrow m_{Fe_2\left(SO_4\right)_3}=0,4.400=160\left(g\right)\)
c) Theo PTHH: \(n_{H_2SO_4}=3.n_{Fe_2O_3}=1,2\left(mol\right)\)
=> \(m_{H_2SO_{\text{4}}}=1,2.98=117,6\left(g\right)\Rightarrow C\%_{H_2SO_4}=\dfrac{117,6}{180}.100\%=65,33\%\)