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

b: \(n_{H2}=\dfrac{3.36}{22.4}=0.15\left(mol\right)\)

\(\Leftrightarrow n_{Al}=0.1\left(mol\right)\)

\(m_{Al}=n_{Al}\cdot M_{Al}=0.1\cdot27=2.7\left(g\right)\)

Theo gt ta có: $n_{Al}=0,1(mol)$

a, $2Al+6HCl\rightarrow 2AlCl_3+3H_2$

b, $\Rightarrow n_{H_2}=0,15(mol)\Rightarrow V_{H_2}=3,36(l)$

c, Ta có: $n_{HCl}=0,3(mol)\Rightarrow m_{HCl}=10,95(g)\Rightarrow \%m_{ddHCl}=219(g)$

d, Bảo toàn khối lượng ta có: $m_{dd}=221,4(g)$

$\Rightarrow \%C_{AlCl_3}=6,02\%$

a.b.\(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{5,4}{27}=0,2mol\)

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

0,2                                              0,3    ( mol )

\(V_{H_2}=n_{H_2}.22,4=0,3.22,4=6,72l\)

c.\(n_{CuO}=\dfrac{m_{CuO}}{M_{CuO}}=\dfrac{32}{80}=0,4mol\)

\(CuO+H_2\rightarrow Cu+H_2O\)

 0,4  <  0,3                          ( mol )

0,3        0,3      0,3                   ( mol )

\(m_A=m_{CuO\left(du\right)}+m_{Cu}=\left[\left(0,4-0,3\right).80\right]+\left(0,3.64\right)=8+19,2=27,2g\)

\(nHCl=0,2.0,3=0,06\\ 2Al+6HCl=>2AlCl3+3H2\\ =>nAl=0,02\left(mol\right)\\ =>mAl=0,02.27=0,54\left(g\right)\\ tacónAlCl3=0,02\left(mol\right)\\ =>Cm\left(AlCl3\right)=\dfrac{0,02}{0,2}=0,1\left(M\right)\)

a, \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

b, \(n_{HCl}=0,2.0,3=0,06\left(mol\right)\)

Theo PT: \(n_{Al}=\dfrac{1}{3}n_{HCl}=0,02\left(mol\right)\)

\(\Rightarrow m_{Al}=0,02.27=0,54\left(g\right)\)

c, \(n_{AlCl_3}=\dfrac{1}{3}n_{HCl}=0,02\left(mol\right)\)

\(\Rightarrow C_{M_{AlCl_3}}=\dfrac{0,02}{0,2}=0,1\left(M\right)\)

`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

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

a

PTHH:

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

0,2--->0,6----->0,2------->0,3

b

\(C\%_{dd.HCl.đã.dùng}=\dfrac{0,6.36,5.100\%}{200}=10,95\%\)

c

\(V_{H_2}=0,3.22,4=6,72\left(l\right)\)

\(n_{Fe}=\dfrac{22,4}{56}=0,4\) (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) \(m_{HCl}=0,8.36.5=29,2\left(g\right)\)

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

Câu 1:

Ta có: \(n_{H_2SO_4}=0,25.1=0,25\left(mol\right)\)

PT: \(Na_2CO_3+H_2SO_4\rightarrow Na_2SO_4+H_2O+CO_2\)

\(CaCO_3+H_2SO_4\rightarrow CaSO_4+H_2O+CO_2\)

\(MgCO_3+H_2SO_4\rightarrow MgSO_4+H_2O+CO_2\)

Theo PT, có: \(n_{H_2O}=n_{CO_2}=n_{H_2SO_4}=0,25\left(mol\right)\)

\(\Rightarrow V_{CO_2}=0,25.22,4=5,6\left(l\right)\)

Theo ĐLBT KL, có: m_hh + m_H2SO4 = m _muối + m_H2O + m_CO2

⇒ m _muối = m_hh + m_H2SO4 - m_H2O - m_CO2

= 25,2 + 0,25.98 - 0,25.18 - 0,25.44

= 34,2 (g)

Bạn tham khảo nhé!

Câu 2:

Ta có: \(n_{H_2SO_4}=0,5\cdot0,75=0,375\left(mol\right)=n_{H_2O}\)

\(\Rightarrow\left\{{}\begin{matrix}m_{H_2SO_4}=0,375\cdot98=36,75\left(g\right)\\m_{H_2O}=0,375\cdot18=6,75\left(g\right)\end{matrix}\right.\)

Bảo toàn khối lượng: \(m_{oxit}=m_{muối}+m_{H_2O}-m_{H_2SO_4}=28,5\left(g\right)\)

Không biết Fe,O, là chất gì bạn nhỉ?