Cho 14,4 gam FeO tác dụng vừa đủ với dung dịch H2SO4 9,8%. Tính nồng độ % của dung dịch FeSO4
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`Fe + H_2 SO_4 -> FeSO_4 + H_2 ↑`
`0,3` `0,3` `0,3` `0,3` `(mol)`
`n_[Fe] = [ 16,8 ] / 56 = 0,3 (mol)`
`a) m_[dd H_2 SO_4] = [ 0,3 . 98 ] / [ 9,8 ] . 100 = 300 (g)`
`b) V_[H_2] = 0,3 . 22,4 = 6,72 (l)`
`c) C%_[FeSO_4] = [ 0,3 . 152 ] / [ 16,8 + 300 - 0,3 . 2 ] . 100 ~~ 14,42%`
\(n_{H_2SO_4}=\dfrac{150.9,8\%}{98}=0,15\left(mol\right)\\ H_2SO_4+Na_2CO_3\rightarrow Na_2SO_4+H_2O+CO_2\\ n_{Na_2CO_3}=n_{H_2SO_4}=0,15\left(mol\right)\\ \Rightarrow m_{ddNa_2CO_3}=\dfrac{0,15.106}{10,6\%}=150\left(g\right)\\ n_{CO_2}=n_{H_2SO_4}=0,15\left(mol\right)\\ m_{ddsaupu}=150+150-0,15.44=293,4\left(g\right)\\ n_{Na_2SO_4}=n_{H_2SO_4}=0,15\left(mol\right)\\ C\%_{Na_2SO_4}=\dfrac{0,15.142}{293,4}.100=7,26\%\)
chị ơi cho em hỏi tại sao lại 150* 9,8% lại chia cho 98 ạ
\(n_{Fe}=\dfrac{11,2}{56}=0,2(mol)\\ Fe+H_2SO_4\to FeSO_4+H_2\\ \Rightarrow n_{H_2SO_4}=n_{FeSO_4}=n_{H_2}=0,2(mol)\\ a,V_{H_2}=0,2.22,4=4,48(l)\\ b,m_{dd_{H_2SO_4}}=\dfrac{0,2.98}{9,8\%}=200(g)\\ c,C\%_{FeSO_4}=\dfrac{0,2.152}{11,2+200-0,2.2}.100\%=14,42\%\)
\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
Pt : \(Fe+H_2SO_4\rightarrow FeSO_4+H_2|\)
1 1 1 1
0,1 0,1 0,1
a) \(n_{H2SO4}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
\(V_{ddH2SO4}=\dfrac{0,1}{2}=0,05\left(l\right)\)
b) \(n_{FeSO4}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)
\(C_{M_{FeSO4}}=\dfrac{0,1}{0,05}=2\left(M\right)\)
Chúc bạn học tốt
PTHH:\(CaO+H_2SO_4\rightarrow CaSO_4+H_2O \)
tl 1 : 1 : 1 : 1 (mol)
br \(\dfrac{1}{7}\) -> \(\dfrac{1}{7}\)
n\(_{CaO}=\dfrac{8}{56}=\dfrac{1}{7}\left(mol\right)\)
Đổi 200ml=0,2l
=>\(C_{MH_2SO_4}=\dfrac{\dfrac{1}{7}}{0,2}=\dfrac{5}{7}\left(M\right)\)
\(n_{CaO}=\dfrac{m}{M}=\dfrac{8}{56}=0,14\left(mol\right)\)
PTHH:\(CaO+H_2SO_4\rightarrow CaSO_4+H_2O\)
0,14 0,14
\(CM=\dfrac{n_{ct}}{V_{dd}}=\dfrac{0,14}{0,2}=0,7\left(M\right)\)
\(n_{FeO}=\dfrac{10.8}{72}=0.15\left(mol\right)\)
\(FeO+2HCl\rightarrow FeCl_2+H_2O\)
\(0.15.......0.3.............0.15\)
\(m_{HCl}=0.3\cdot36.5=10.95\left(g\right)\)
\(C\%HCl=\dfrac{10.95}{100}\cdot100\%=10.95\%\)
\(m_{dd}=10.8+100=110.8\left(g\right)\)
\(m_{FeCl_2}=0.15\cdot127=19.05\left(g\right)\)
\(C\%FeCl_2=\dfrac{19.05}{110.8}\cdot100\%=17.19\%\)
nFeO=10.872=0.15(mol)nFeO=10.872=0.15(mol)
FeO+2HCl→FeCl2+H2OFeO+2HCl→FeCl2+H2O
0.15.......0.3.............0.150.15.......0.3.............0.15
mHCl=0.3⋅36.5=10.95(g)mHCl=0.3⋅36.5=10.95(g)
C%HCl=10.95100⋅100%=10.95%C%HCl=10.95100⋅100%=10.95%
mdd=10.8+100=110.8(g)mdd=10.8+100=110.8(g)
mFeCl2=0.15⋅127=19.05(g)mFeCl2=0.15⋅127=19.05(g)
C%FeCl2=19.05110.8⋅100%=17.19%C%FeCl2=19.05110.8⋅100%=17.19%
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)
\(\Rightarrow C\%_{MgSO_4}=\dfrac{0,2.120}{208}.100\%\approx11,54\%\)
\(n_{FeO}=\dfrac{14,4}{72}=0,2\left(mol\right)\)
PTHH : \(FeO+H_2SO_4\rightarrow FeSO_4+H_2O\)
Theo Pt : \(n_{FeO}=n_{H2SO4}=n_{FeSO4}=0,2\left(mol\right)\)
\(m_{ddH2SO4}=\dfrac{0,2.98}{9,8\%}.100\%=200\left(g\right)\)
\(m_{ddspu_{ }}=14,4+200=214,4\left(g\right)\)
\(C\%_{FeSO4}=\dfrac{0,2.152}{214,4}.100\%=14,18\%\)