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

\(n_{H_2SO_4}=0,2.1,35=0,27\left(mol\right)\)

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

Xét tỉ lệ: \(\dfrac{0,2}{2}>\dfrac{0,27}{3}\), ta được Al dư.

Theo PT: \(n_{H_2}=n_{H_2SO_4}=0,27\left(mol\right)\Rightarrow V_{H_2}=0,27.22,4=6,048\left(l\right)\)

b, \(n_{Al\left(pư\right)}=\dfrac{2}{3}n_{H_2SO_4}=0,18\left(mol\right)\)

\(\Rightarrow m_{Al\left(pư\right)}=0,18.27=4,86\left(g\right)\)

c, \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2SO_4}=0,09\left(mol\right)\)

\(\Rightarrow C_{M_{Al_2\left(SO_4\right)_3}}=\dfrac{0,09}{0,2}=0,45\left(M\right)\)

Bài 1:

A . PTHH : 2AI + 3H₂SO₄ => AI₂(SO₄)₃ + 3H₂

B . nAI = 7.1 : 27 = 0.2 (mol)

 PT :2AI         +       3H₂SO₄      =>        AI₂(SO₄)₃       +   3H₂

        _{2 mol              3 mol                                                       3 mol}

        _{0.2 mol            0.3 mol                                                    0.3 mol}

=> V_{H2 = 22.4 X 0.3 = 6.72 (lít)}  

3.  500ml = 0.5 lít

Nồng độ mol/l của dd H₂SO₄ là:

C_{M H2SO4} = mol/lít =0.3/0.5 = 0.6 MOL/ LÍT

chuẩn nha hoàng kiều anh

a) 

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

b)  \(n_{Zn=\frac{16,12}{65}=0,248\left(mol\right)}\)

Theo PTHH :  \(n_{H_2}=n_{Zn}=0,248\left(mol\right)\)

\(V_{H_2\left(đktc\right)}=0,248\times22,4=5,5552\left(l\right)\)

c ) Ta có :

Theo PTHH :  \(n_{HCl}=2n_{Zn}=0,496\left(mol\right)\)

\(\Rightarrow m_{HCl}=18,104\left(g\right)\)

\(m_{dd}=\frac{18,104\times100}{10}=181,04\left(g\right)\)

2Al + 3H₂SO₄ \(\rightarrow\) Al₂(SO₄)₃ + 3H₂

nAl = 5,4 : 27 = 0,2 mol

Theo pt: nH₂ = \(\dfrac{3}{2}\)nAl = 0,3 mol

=> V H₂ = 0,3.22,4 = 6,72 lít

b)nAl₂(SO₄)₃ = \(\dfrac{1}{2}nAl=0,1mol\)

=>mAl₂(SO₄)₃ = 0,1.342 = 34,2g

\(n_{Al}=0,2\left(mol\right)\)

\(2Al+6HCl-->2AlCl_3+3H_2\)

0,2......0,6.....................0,2............0,3

\(a=m_{HCl}=0,6.36,5=21,9\left(g\right)\)

\(b=m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)

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

a)n_Al=m/M=5,4/27=0,2 (mol)

pt: 2Al + 6HCl -> 2AlCl₃ +3H₂

cứ:: 2.........6............2...........3 (mol)

Vậy: 0,2---->0,6---->0,2----->0,3 (mol)

b) Vậy ta có: a=m_HCl=n.M=0,6.36,5=21,9(g)

b=m_AlCl3=n.M=0,2.133,5=26,7(g)

V=V_H2=n.22,4=0,3.22,4=6,72(lít)

n_Al=\(\dfrac{m}{M}=\dfrac{5,4}{27}=0,2\left(mol\right)\)

a, pthh: 2Al + 6HCl \(\rightarrow\) 2AlCl₃ + 3H₂

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

b, m_HCl=a=n.M=0,6.36,5=21,9(g)

m_AlCl3=b=n.M=0,2.133,6=26,7(g)

V_H2=n.22,4=0,3.22,4=6,72(l)

\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\a, 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ n_{H_2}=n_{H_2SO_4}=\dfrac{3}{2}.0,2=0,3\left(mol\right)\\ b,V_{H_2\left(đktc\right)}=0,3.22,4=6,72\left(l\right)\\ c,n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}.0,2=0,1\left(mol\right)\\ m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2\left(g\right)\\ d,C\%_{ddH_2SO_4}=\dfrac{0,3.98}{200}.100\%=14,7\%\\ e,m_{ddmuoi}=5,4+200-0,3.2=204,8\left(g\right)\\ C\%_{ddAl_2\left(SO_4\right)_3}=\dfrac{34,2}{204,8}.100\%\approx16,699\%\)

\(a)2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ b)n_{Al}=\dfrac{5,4}{27}=0,2mol\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

\(0,2-\rightarrow0,3--\rightarrow0,1--\rightarrow0,3\)

\(m_{H_2}=0,3.2=0,6g\\ c)m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2g\\ d)C_{\%H_2SO_4}=\dfrac{0,3.98}{200}\cdot100=14,7\%\\ e)C_{\%Al_2\left(SO_4\right)_3}=\dfrac{34,2}{5,4+200-0,6}\cdot100=16,7\%\)

\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\\ pthh:2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\) 
            0,2          0,3                                   0,3 
\(V_{H_2}=0,3.22,4=6,72l\\ C\%_{H_2SO_4}=\dfrac{0,3.98}{200}.100\%=14,7\%\)

\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\\ n_{H_2SO_4}=n_{H_2}=n_{FeSO_4}=n_{Fe}=0,2\left(mol\right)\\ a,m_{H_2SO_4}=0,2.98=19,6\left(g\right)\\ b,C\%_{ddH_2SO_4}=\dfrac{19,6}{200}.100=9,8\%\\ c,m_{FeSO_4}=152.0,2=30,4\left(g\right)\\ d,V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\)