\(n_{NH_3}=\dfrac{4,958}{24,79}=0,2(mol)\)

\(a,n_{CH_4}=\dfrac{4,958}{24,79}=0,2(mol)\\ b,m_{CH_4}=0,2.16=3,2(g)\)

a) \(n_{Fe}=\dfrac{28}{56}=0,5\left(mol\right)\)

b) \(n_{Al}=\dfrac{13,5}{27}=0,5\left(mol\right)\)

c) \(n_{CO_2}=\dfrac{11}{44}=0,25\left(mol\right)\)

d) \(m_{O_2}=\dfrac{4,958.0,99}{0,082.\left(273+25\right)}=0,2\left(mol\right)\)

e) \(m_{CH_4}=\dfrac{12,359.0,99}{0,082\left(273+25\right)}=0,5\left(mol\right)\)

a: \(n=\dfrac{28}{56}=0.5\left(mol\right)\)

b: \(n=\dfrac{13.5}{27}=0.5\left(mol\right)\)

\(n_{SO_2}=\dfrac{4,958}{24,79}=0,2(mol)\)

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

PTHH: Fe + H₂SO₄ → FeSO₄ + H₂

Mol:    0,1         0,1            0,1          0,1

\(V_{H_2}=0,1.24,79=2,479\left(l\right)\)

\(C_{M_{ddH_2SO_4}}=\dfrac{0,1}{0,2}=0,5M\)

\(C_{M_{ddFeSO_4}}=\dfrac{0,1}{0,2}=0,5M\)

1)

$CH_4 +2 O_2 \xrightarrow{t^o} CO_2 + 2H_2O$

Theo PTHH : 

$V_{O_2\ cần\ dùng} = 2V_{CH_4} = 24,79(lít)$
$V_{CO_2} = V_{CH_4} = 12,395(lít)$

2)

a)

$C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O$
$V_{O_2} = 3V_{C_2H_4} = 14,874(lít)$

b) $V_{không\ khí} = V_{O_2} : 20\% = 14,874 : 20\% = 74,37(lít)$

\(n_{SO_2}=\dfrac{4,958}{24,79}=0,2(mol)\\ \Rightarrow m_{SO_2}=0,2.64=12,8(g)\)

\(n_{Al}=\dfrac{m}{M}=\dfrac{0,54}{27}=0,02mol\)

\(n_{H_2SO_4}=\dfrac{m}{M}=\dfrac{22,05}{98}=0,225mol\)

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

0,02 <  0,225                                      ( mol )

0,02                                           0,03  ( mol )

\(V_{H_2}=n.22,4=0,03.24,79=0,7437l\)