\(a.Mg+2HCl\rightarrow MgCl_2+H_2\\ n_{H_2}=\dfrac{44,8}{22,4}=2\left(mol\right)\\ n_{HCl}=2n_{H_2}=4\left(mol\right)\\ \Rightarrow m_{HCl}=4.36,5=146\left(g\right)\\ c.n_{MgCl_2}=n_{H_2}=2\left(mol\right)\\ \Rightarrow m_{MgCl_2}=2.95=190\left(g\right)\)

a)

 \(PTHH:Mg+2HCl->MgCl_2+H_2\)

               2<------4<----------2<---------2   (mol)

b)

\(n_{H_2\left(dktc\right)}=\dfrac{V}{22,4}=\dfrac{44,8}{22,4}=2\left(mol\right)\)

\(m_{HCl}=n\cdot M=4\cdot\left(1+35,5\right)=146\left(g\right)\)

c)

\(m_{MgCl_2}=n\cdot M=2\cdot\left(24+71\right)=190\left(g\right)\)

\(n_{H_2}=\dfrac{V}{22,4}=\dfrac{44,8}{22,4}=2\left(mol\right)\)

\(\text{a)}Mg+2HCl\rightarrow MgCl_2+H_2\)

             \(2mol\)       \(1mol\)       \(1mol\)

              \(4mol\)       \(2mol\)       \(2mol\)

\(b)m_{HCl}=n.M=4.36,5=146\left(g\right)\)

\(c)m_{MgCl_2}=n.M=2.95=190\left(g\right)\)

a) PTHH: 2Al + 6HCl -> 2AlCl3 + 3 H2

b) nHCl=0,6(mol); nAl=0,3(mol)

Ta có: 0,3/2 > 0,6/6

=> HCl hết, Al dư, tính theo nHCl

c) nH2= 3/6 . nHCl=3/6 . 0,6= 0,3(mol)

=> V=V(H2,đktc)=0,3.22,4= 6,72(l)

a) Nhôm + Axit clohidric --> Nhôm clorua + Khí hidro

b) 2Al + 6HCl --> 2AlCl₃ + 3H₂

c) Theo ĐLBTKL: m_Al + m_HCl = m_AlCl3 + m_H2

=> m_HCl = 26,7 + 0,6 - 5,4 = 21,9(g)

\(2Al+6HCl\to 2AlCl_3+3H_2\)

`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

Bài 1 :

a. \(n_{Al}=\dfrac{2.7}{27}=0,1\left(mol\right)\)

PTHH : 2Al + 6HCl -> 2AlCl₃ + 3H₂

            0,1        0,3                     0,15

b. \(V_{H_2}=0,15.22,4=3,36\left(l\right)\)

c. \(m_{HCl}=0,3.36,5=10,95\left(g\right)\)

Bài 2 :

a. \(n_{Na}=\dfrac{2.3}{23}=0,1\left(mol\right)\)

PTHH : 2Na + 2H₂O -> 2NaOH + H₂

             0,1                    0,1          0,05

b. \(V_{H_2}=0,05.22,4=1,12\left(l\right)\)    

c. \(m_{NaOH}=0,1.40=4\left(g\right)\)   

 2Al + 6HCl ----> 2AlCl₃ + 3H₂

0,1-------0,3---------0,1

n Al=0,1 mol

=>m dd HCl=54,75g

=>C% AlCl3=\(\dfrac{0,1.133,5}{2,7+54,75}100=23,23\%\)