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

                \(2mol\)   \(6mol\)       \(2mol\)       \(3mol\)

                \(0,27\)      \(x\)             \(y\)             \(z\)

b) ta có: \(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{7,3}{27}=0,27\left(mol\right)\)

theo PT: \(n_{Al}=n_{AlCl_3}=0,27\left(mol\right)\)

\(\Rightarrow m_{AlCl_3}=n_{AlCl_3}.M_{AlCl_3}=0,27.133,5=36,045\left(g\right)\)

c) ta có: \(n_{H_2}=\dfrac{m_{H_2}}{M_{H_2}}=\) \(\dfrac{0,27.3}{2}=0,405\left(mol\right)\)

\(\Rightarrow V_{H_2\left(đktc\right)}=n_{H_2}.22,4=0,405.22,4=9,072\left(l\right)\)

xin lỗi bạn vừa nãy nhìn nhầm xíu :v

mình làm lại này:

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

theo PT:   \(2mol\)   \(6mol\)      \(2mol\)        \(3mol\)

                 \(x\)          \(0,2\)         \(y\)               \(z\)

b) \(n_{HCl}=\dfrac{m_{HCl}}{M_{HCl}}=\dfrac{7,3}{36,5}=0,2\left(mol\right)\)

\(\Rightarrow n_{AlCl_3}=\dfrac{0,2.2}{6}=0,06\left(mol\right)\)

\(\Rightarrow m_{AlCl_3}=n_{AlCl_3}.M_{AlCl_3}=0,06.133,5=8,01\left(g\right)\)

c) \(n_{H_2}=\dfrac{0,2.3}{6}=0,1\left(mol\right)\)

\(\Rightarrow V_{H_2}=n_{H_2}.22,4=0,1.22,4=2,24\left(l\right)\)

Áp dụng ĐLBTKL, ta có: 

\(10,8+43,8=m_{AlCl_3}+\dfrac{6,72}{22,4}.2\)

\(\Leftrightarrow m_{AlCl_3}=10,8+43,8-0,6=54\left(g\right)\)

2 là khối lượng mol của H₂ nhé

a)

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

PTHH: 2Al + 6HCl --> 2AlCl₃ + 3H₂

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

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

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

c)

PTHH: Zn + H₂SO₄ --> ZnSO₄ + H₂

                      0,3<----------------0,3

=> \(m_{H_2SO_4}=0,3.98=29,4\left(g\right)\)

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

PTHH:

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

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

\(V_{H_2}=0,3.22,4=6,72\left(l\right)\\ b,m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)

c, PTHH:

\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)

           0,2<------------------0,2

\(m_{H_2SO_4}=0,2.98=19,6\left(g\right)\)

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

\(n_{Al}=\dfrac{3,375}{27}=0,125\)

\(\Rightarrow n_{H_2}=\dfrac{0,125}{2}.3=0,1875mol\)      \(\Rightarrow V_{H_2}=0,1875.22,4=4,2l\)

\(n_{AlCl_3}=n_{Al}=0,125mol\)       \(\Rightarrow m_{AlCl_3}=0,125.133,5=16,6875g\)

Bài 5:

có thêm đc câu 6 thì tốt. Em cảm ơn ạ

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

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

0,2                      0,2          0,3    ( mol )

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

\(m_{AlCl_3}=n_{AlCl_3}.M_{AlCl_3}=0,2.133,5=26,7g\)

\(\left(a\right)2Al+3H_2O\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ \left(b\right)n_{H_2}=\dfrac{13,44}{22,4}=0,6mol\\ n_{Al}=\dfrac{0,6.2}{3}=0,4mol\\ m_{Al}=0,4.27=10,8g\\ \left(c\right)n_{O_2}=\dfrac{4,8}{32}=0,15mol\\ 4Al+3O_2\underrightarrow{t^0}2Al_2O_3\\ \Rightarrow\dfrac{0,4}{4}>\dfrac{0,15}{3}\Rightarrow Al.dư\\ n_{Al_2O_3}=\dfrac{0,15.2}{3}=0,1mol\\ m_{oxit}=m_{Al_2O_3}=0,1.102=10,2g\)

a: \(2Al+3H_2SO_4\rightarrow1Al_2\left(SO_4\right)_3+3H_2\uparrow\)

    0,4           0,6                0,2             0,6

b: \(n_{H_2}=\dfrac{13.44}{22.4}=0.6\left(mol\right)\)

=>\(n_{Al}=0.4\left(mol\right)\)

\(m_{Al}=0.4\cdot27=10.8\left(g\right)\)

c: \(4Al+3O_2\rightarrow2Al_2O_3\)

0,4                      0,2

\(m_{Al_2O_3}=0.2\left(27\cdot2+16\cdot3\right)=0.2\cdot102=20.4\left(g\right)\)

\(n_{H_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)

PTHH ;

2Al + 3H2SO4 --> Al2(SO4)3 + 3H2↑

  0,4           0,6               0,2           0,6

4Al + 3O2 ---> 2Al2O3

0,2       0,15          0,1 

\(n_{O_2}=\dfrac{4,8}{32}=0,15\left(mol\right)\)

\(\dfrac{0,4}{4}>\dfrac{0,15}{3}\)

--> Tính theo oxi

\(b,m_{Al}=0,4.27=10,8\left(g\right)\)

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

 2Al + 6HCl ----> 2AlCl₃ + 3H₂

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

n Al=0,1 mol

=>m dd HCl=54,75g

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