\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\Tacó: n_{Fe}=n_{H_2SO_4}=n_{FeSO_4}=n_{H_2}=0,2\left(mol\right)\\ \Rightarrow m_{FeSO_4}=0,2.152=30,4\left(g\right)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\\ \Rightarrow C\%_{H_@SO_4}=\dfrac{0,2.98}{200}.100=9,8\%\)

\(n_{Fe}=\dfrac{22,4}{56}=0,4\) (mol) (1)

Phương trình hóa học : 

Fe + 2HCl ---> FeCl₂ + H₂ (2) 

Từ (1) và (2) ta có \(n_{FeCl_2}=n_{H_2}=0,4\) (mol) ; \(n_{HCl}=0,8\left(mol\right)\)

b) => \(m_{\text{muối}}=0,4.\left(56+35,5.2\right)=50.8\left(g\right)\)

c) \(V_{\text{khí}}=0,4.22,4=8,96\left(l\right)\)

d) \(m_{HCl}=0,8.36.5=29,2\left(g\right)\)

\(\Rightarrow C\%=\dfrac{29,2}{200}.100\%=14,6\%\)

`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) \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)

PTHH: Fe + 2HCl --> FeCl₂ + H₂

          0,1-->0,2------>0,1--->0,1

=> \(m_{FeCl_2}=0,1.127=12,7\left(g\right)\)

b) m_{dd sau pư} = 5,6 + 200 - 0,1.2 = 205,4 (g)

=> \(C\%=\dfrac{12,7}{205,4}.100\%=6,18\%\)

PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)

Ta có: \(\left\{{}\begin{matrix}n_{Al}=\dfrac{4,05}{27}=0,15\left(mol\right)\\n_{H_2SO_4}=\dfrac{294\cdot10\%}{98}=0,3\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,15}{2}< \dfrac{0,3}{3}\) \(\Rightarrow\) Axit còn dư

\(\Rightarrow\left\{{}\begin{matrix}n_{Al_2\left(SO_4\right)_3}=0,075\left(mol\right)=n_{H_2SO_4\left(dư\right)}\\n_{H_2}=0,225\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,225\cdot22,4=5,04\left(l\right)\\m_{Al_2\left(SO_4\right)_3}=0,075\cdot342=25,65\left(g\right)\\m_{H_2SO_4\left(dư\right)}=0,075\cdot98=7,35\left(g\right)\\m_{H_2}=0,225\cdot2=0,45\left(g\right)\end{matrix}\right.\)

Mặt khác: \(m_{dd}=m_{Al}+m_{ddH_2SO_4}-m_{H_2}=297,6\left(g\right)\)

\(\Rightarrow\left\{{}\begin{matrix}C\%_{Al_2\left(SO_4\right)_3}=\dfrac{25,65}{297,6}\cdot100\%\approx8,62\%\\C\%_{H_2SO_4\left(dư\right)}=\dfrac{7,35}{297,6}\cdot100\%\approx4,47\%\end{matrix}\right.\)

nMg = 4,8 : 24 = 0,2 mol

a) Mg  +  H₂SO₄  →  MgSO₄  +   H₂

Theo tỉ lệ phản ứng => nH₂SO₄ phản ứng = nMgSO₄ = nH₂ = 0,2 mol

=> VH₂ = 0,2.22,4 = 4,48 lít.

b)

mH₂SO₄ phản ứng = 0,2.98 = 19,6 gam

=> C% _H2SO4 = \(\dfrac{19,6}{300}.100\text{%}\) = 6,53%

c) mMgSO₄ = 0,2.120 = 24 gam.

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\a, PTHH:Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ b,n_{H_2}=n_{H_2SO_4}=n_{Fe}=0,2\left(mol\right)\\ V_{H_2\left(đkc\right)}=0,2.24,79=4,958\left(l\right)\\ c,C_{MddH_2SO_4}=\dfrac{0,2}{0,4}=0,5\left(M\right)\)

\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ pthh:Fe+2HCl\rightarrow FeCl_2+H_2\) 
           0,1     0,2         0,1           0,1 
\(V_{H_2}=0,1.22,4=2,24\left(l\right)\\ m_{HCl}=\dfrac{\left(0,2.36,5\right).100}{24,5}=29,795\left(g\right)\\ m_{\text{dd}}=5,6+29,795-\left(0,1.2\right)=35,195\left(g\right)\\ C\%=\dfrac{0,1.127}{35,195}.100\%=36\%\)