\(n_{HCl}=\dfrac{18.25}{36.5}=0.5\left(mol\right)\)

\(a.Mg+2HCl\rightarrow MgCl_2+H_2\)

\(b.\)

\(n_{Mg}=n_{H_2}=\dfrac{1}{2}\cdot n_{HCl}=\dfrac{1}{2}\cdot0.5=0.25\left(mol\right)\)

\(m_{Mg}=0.25\cdot24=6\left(g\right)\)

\(V_{H_2}=0.25\cdot22.4=5.6\left(l\right)\)

\(c.\)

\(V_{H_2\left(tt\right)}=5.6\cdot90\%=5.04\left(l\right)\)

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

Làm gộp các phần còn lại

Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}n_{Al_2\left(SO_4\right)_3}=0,1mol\\n_{H_2SO_4}=n_{H_2}=0,3mol\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\m_{Al_2\left(SO_4\right)_3}=0,1\cdot342=34,2\left(g\right)\\m_{H_2SO_4}=0,3\cdot98=29,4\left(g\right)\end{matrix}\right.\) 

\(n_{H_2}=\dfrac{6,72}{22,4}=0,3mol\\ a.2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ b.n_{Al_2\left(SO_4\right)_3}=\dfrac{0,3}{3}=0,1mol\\ m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2g\)

nAl = 5.4/27 = 0.2 mol 

2Al + 3H2SO4 => Al2(SO4)3 + 3H2 

0.2______________0.1________0.3 

VH2 = 0.3*22.4 = 6.72 (l) 

mAl2(SO4)3 = 0.1*342 = 34.2 g 

\(a) Mg + 2HCl \to MgCl_2 + H_2\\ b) n_{MgCl_2} = n_{Mg} = \dfrac{0,24}{24} = 0,01(mol)\\ m_{MgCl_2} = 0,01.95 = 0,95(gam)\\ c) n_{H_2} = n_{Mg} = 0,01(mol) \Rightarrow V_{H_2} = 0,01.22,4 = 0,224(lít)\)

a) $Zn + H_2SO_4 \to ZnSO_4 + H_2$

b) Theo PTHH :

$n_{H_2} = n_{ZnSO_4} = n_{Zn} = \dfrac{32,5}{65} = 0,5(mol)$

$V_{H_2} = 0,5.22,4 = 11,2(lít)$

$m_{ZnSO_4} = 0,5.161 = 80,5(gam)$

c) 

$n_{H_2SO_4} = n_{Zn} = 0,5(mol)$

$C\%_{H_2SO_4} = \dfrac{0,5.98}{168,5}.100\% = 29,08\%$

`a)PTHH:`

`2Al + 6HCl -> 2AlCl_3 + 3H_2`

`0,2`     `0,6`                               `0,3`       `(mol)`

`n_[Al]=[5,4]/27=0,2(mol)`

`b)V_[H_2]=0,3.22,4=6,72(l)`

`c)m_[dd HCl]=[0,6.36,5]/10 . 100 =219(g)`

n_Al  = \(\dfrac{5,4}{27}\) = 0,2 (mol)

 2Al + 6HCl -> 2AlCl₃ + 3H₂

     0,2     0,6       0,2      0,3

=>VH2=0,3.22,4=6,72l

=>mHcl=0,6.36,5=21,9g

=>mdd=219g

\(n_{Zn}=\dfrac{3,9}{65}=0,06mol\)

\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)

0,06    0,12       0,06        0,06

\(V_{H_2}=0,06\cdot22,4=1,344l\)

\(d_{H_2}\)_/CO2=\(\dfrac{M_{H_2}}{M_{CO_2}}=\dfrac{2}{44}=\dfrac{1}{22}\)

\(m_{HCl}=0,12\cdot36,5=4,38g\)

\(m_{ZnCl_2}=0,06\cdot136=8,16g\)

a) Zn + 2HCl ---> ZnCl2 + H2
b) nZn = 3,9:65= 0,06 ( mol) 
 theo pt , nH2 =nZn= 0,06 (mol) 
=> VH2(ĐKTC) = 0,06.22,4=1,344(l)
H2/CO2 = MH2/MCO2 =2/44=1/22 
c) theo pt nHCl = 2nZn = 2.0,06=0,12(mol)
=> mHCl= 0,12 . 36,5=4,38(g) 
d) theo pt , nZnCl2= nZn = 0,06(mol) 

=> m ZnCl2 = 0,06.136=8,16 (g)

a, PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)

b, Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

Theo PT: \(n_{Fe}=n_{H_2}=0,1\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{0,1.56}{21,6}.100\%\approx25,93\%\\\%m_{Fe_2O_3}\approx100-25,93=74,07\%\end{matrix}\right.\)

a, PT: 

b, Ta có: ⇒⎧⎪⎨⎪⎩%mFe=0,1.5621,6.100%≈25,93%%mFe2O3≈100−25,93=74,07%