\(1.\\ a)V_{CH_4}=1,5.24,79=37,185l\\ 2.\\ m_{ddKCl}=20+60=80g\\ C_{\%KCl}=\dfrac{20}{80}\cdot100\%=25\%\)

\(n_{Fe_2O_3}=\dfrac{24}{160}=0,15(mol)\\ \Rightarrow n_{CO}=3n_{Fe_2O_3}=0,45(mol)\\ \Rightarrow V_{CO(25^oC,1bar)}=24,79.0,45=11,1555(l)\)

Chọn B

a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)

PTHH: 4Al + 3O₂ ---t^o→ 2Al₂O₃

Mol:     0,2     0,15             0,1

b) \(V_{O_2}=0,15.24,79=3,7185\left(mol\right)\)

c) \(m_{Al_2O_3}=0,1.102=10,2\left(g\right)\)

\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ a,4Al+3O_2\underrightarrow{^{to}}2Al_2O_3\\ 0,2.......0,15........0,1\left(mol\right)\\ b,V_{O_2\left(25^oC,1bar\right)}=24,79.0,15=3,7185\left(l\right)\\ c,m_A=m_{Al_2O_3}=0,1.102=10,2\left(g\right)\)

\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\ a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,1\left(mol\right)\\ m_{muối}=m_{ZnCl_2}=0,1.136=13,6\left(g\right)\\ V_{khí\left(đktc\right)}=V_{H_2\left(đkc\right)}=0,1.24,79=2,479\left(l\right)\\ c,n_{CuO}=\dfrac{7,6}{80}=0,095\left(mol\right)\\ PTHH:CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\\ Vì:\dfrac{0,095}{1}< \dfrac{0,1}{1}\Rightarrow H_2dư\\ n_{Cu}=n_{CuO}=0,095\left(mol\right)\\ m_{Cu}=0,095.64=6,08\left(g\right)\)

a, \(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)

b, \(n_{Mg}=\dfrac{4,1}{24}=\dfrac{41}{240}\left(mol\right)\)

Theo PT: \(n_{H_2}=n_{MgSO_4}=n_{Mg}=\dfrac{41}{240}\left(mol\right)\)

\(\Rightarrow V_{H_2}=\dfrac{41}{240}.24,79\approx4,23\left(l\right)\)

c, \(m_{MgSO_4}=\dfrac{41}{240}.120=20,5\left(g\right)\)

\(n_{Mg}=\dfrac{4,1}{24}=\dfrac{41}{210}\left(mol\right)\)

PTHH :

\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\)

41/210                 41/210      41/210

\(b,V_{H_2}=\dfrac{41}{240}.24,79=4,235\left(l\right)\)

\(c,m_{MgSO_4}=\dfrac{41}{240}.120=20,5\left(g\right)\)

\(a)Mg+H_2SO_4\rightarrow MgSO_4+H_2\\ b)n_{Mg}=\dfrac{4,1}{24}\approx0,17mol\\ n_{H_2}=n_{MgSO_4}=n_{Mg}=0,17mol\\ V_{H_2}=0,17.24,79=4,2143l\\ c)m_{MgSO_4}=0,17.120=20,4g\)

\(nC_2H_4=\frac{3,36}{22,4}=0,15mol\)

\(C_2H_4+3O_2\rightarrow2CO_2+2H_2O\)

\(nO_2=3nC_2H_4=0,45mol\)

\(\rightarrow VO_2=0,45.24,79=11,1555l\)

$n_{NH_3} = \dfrac{17}{17} = 1(mol)$

$N_2 + 3H_2 \xrightarrow{t^o} 2NH_3$

Theo PTHH : 

$n_{N_2\ pư} = \dfrac{1}{2}n_{NH_3} = 0,5(mol)$
$n_{H_2\ pư} = \dfrac{3}{2}n_{NH_3} = 1,5(mol)$

Suy ra : 

$n_{N_2\ đã\ dùng} = \dfrac{0,5}{25\%} = 2(mol)$
$n_{H_2\ đã\ dùng} = \dfrac{1,5}{25\%} = 6(mol)$
Vậy  :

$V_{N_2} = 2.22,4 = 44,8(lít)$
$V_{H_2} = 6.22,4 = 134,4(lít)$

t6 là hạn chót đúng ko ? sát deadline quá mà