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![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PT: \(n_{H_2SO_4}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{H_2SO_4}=0,2.98=19,6\left(g\right)\)
c, \(C\%_{H_2SO_4}=\dfrac{19,6}{50}.100\%=39,2\%\)
d, Theo PT: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\\ n_{H_2SO_4}=n_{H_2}=n_{FeSO_4}=n_{Fe}=0,2\left(mol\right)\\ a,m_{H_2SO_4}=0,2.98=19,6\left(g\right)\\ b,C\%_{ddH_2SO_4}=\dfrac{19,6}{200}.100=9,8\%\\ c,m_{FeSO_4}=152.0,2=30,4\left(g\right)\\ d,V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a.
n Fe=28562856=0,5 (mol)
Fe+H2SO4→FeSO4+H2↑
0,5→0,5 0,5 0,5 (mol)
b.
V H2(đktc)=0,5.22,4=11,2 (l)
c.
m HCl=0,5.36,5=18,25 (g)
d.
m FeSO4=0,5.152=76 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a) Fe + H_2SO_4 \to FeSO_4 +H_2\\ b) n_{H_2} = n_{Fe} = \dfrac{5,6}{56} = 0,1(mol)\\ V_{H_2} = 0,1.22,4 = 2,24(lít)\\ c) m_{dd\ sau\ pư} = 5,6 + 224,6 - 0,1.2 = 230(gam)\\ n_{FeSO_4} = n_{Fe} = 0,1(mol)\\ C\%_{FeSO_4} = \dfrac{0,1.152}{230}.100\% = 6,61\%\\ d) ZnO + H_2 \xrightarrow{t^o} Zn + H_2O\\ n_{ZnO} = \dfrac{32,4}{81} = 0,4 > n_{H_2} = 0,1 \to ZnO\ dư\\ n_{ZnO\ pư} = n_{H_2} = 0,1(mol)\\ m_{ZnO\ dư} = 32,4 - 0,1.81 = 24,3(gam)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, Ta có: \(n_{H_2SO_4}=0,5.1=0,5\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{H_2SO_4}=0,5\left(mol\right)\Rightarrow m_{Fe}=0,5.56=28\left(g\right)\)
c, \(n_{FeSO_4}=n_{H_2SO_4}=0,5\left(mol\right)\Rightarrow C_{M_{FeSO_4}}=\dfrac{0,5}{0,5}=1\left(M\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
nFe = 5,6/56 = 0,1 (mol)
Fe + H2SO4 --> FeSO4 + H2
0,1 0,1 0,1 0,1
VH2 = 0,1.22,4 = 2,24 (l)
mddH2SO4(cần dùng ) = \(\dfrac{0,1.98.100\%}{4,9\%}=200\left(g\right)\)
mH2 = 0,1.2=0,2 (g)
mdd = mFe + mddH2SO4 - mH2 = 5,6 + 200 - 0,2 = 205,4 (g)
mFeSO4 = 0,1.152 = 15,2(g)
=> \(C\%_{ddFeSO_4}=\dfrac{15,2.100}{205,4}=7,4\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
Theo PT: \(n_{H_2SO_4}=n_{FeSO_4}=n_{H_2}=n_{Fe}=0,1\left(mol\right)\)
a, \(V_{H_2}=0,1.24,79=2,479\left(l\right)\)
b, \(m_{H_2SO_4}=0,1.98=9,8\left(g\right)\)
\(\Rightarrow m_{ddH_2SO_4}=\dfrac{9,8}{9,8\%}=100\left(g\right)\)
c, Ta có: m dd sau pư = 5,6 + 100 - 0,1.2 = 105,4 (g)
\(\Rightarrow C\%_{FeSO_4}=\dfrac{0,1.152}{105,4}.100\%\approx14,42\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`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%`
a, Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
Theo PT: \(n_{FeSO_4}=n_{Fe}=0,1\left(mol\right)\Rightarrow m_{FeSO_4}=0,1.152=15,2\left(g\right)\)
b, \(n_{H_2}=n_{Fe}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, Sửa đề: 500 ml → 500 (g)
Theo PT: \(n_{H_2SO_4}=n_{Fe}=0,1\left(mol\right)\Rightarrow C\%_{H_2SO_4}=\dfrac{0,1.98}{500}.100\%=1,96\%\)