\(a.2Al+3H_2SO_4->Al_2\left(SO_4\right)_3+3H_2\\ b.n_{Al}=1,5.0,5.0,03=0,0375mol\\ m_{Al}=0,0375.27=1,0125g\\ m_{Al_2\left(SO_4\right)_3}=342\cdot\dfrac{1}{3}\cdot0,03\cdot0,5=1,71g\\V_{H_2}=24,79.0,5.0,03=0,37185L\)

\(a/2Al+3H_2SO_4\xrightarrow[]{}Al_2\left(SO_4\right)_3+3H_2\\ b/n_{H_2SO_4}=0,5.0,03=0,015\left(mol\right)\\ n_{Al_2\left(SO_4\right)_3}=\dfrac{0,015}{3}=0,005\left(mol\right)\\ m_{Al_2\left(SO_4\right)_3}=0,005.342=1,71\left(g\right)\\ n_{Al}=0,005.2=0,01\left(mol\right)\\ m_{Al}=0,01.27=0,27\left(g\right)\\ c/n_{H_2}=0,005.3=0,015\left(mol\right)\\ V_{H_2}=0,015.24,79=0,37185\left(l\right)\)

\(a/2Al+3H_2SO_4\xrightarrow[]{}Al_2\left(SO_4\right)_3+3H_2\)

\(b/30ml=0,03l\\ n_{H_2SO_4}=0,5.0,03=0,0015\left(mol\right)\\ n_{Al}=\dfrac{0,0015.2}{3}=0,001\left(mol\right)\\ m_{Al}=0,001.27=0,027\left(g\right)\\ n_{Al_2\left(SO_4\right)_3}=\dfrac{0,0015}{2}=0,00075\left(mol\right)\\ m_{Al_2\left(SO_4\right)_3}=0,00075.342=0,2565\left(g\right)\)

\(c/n_{H_2}=\dfrac{0,0015.3}{3}=0,0015\left(mol\right)\\ V_{H_2}=0,0015.24,79=0,037185\left(l\right)\)

\(n_{H_2\left(đkc\right)}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\\ 2Al+6HCl\rightarrow2AlCl_3+3H_2\\ n_{Al}=n_{AlCl_3}=\dfrac{2}{3}.n_{H_2}=\dfrac{2}{3}.0,1=\dfrac{1}{15}\left(mol\right)\\ \Rightarrow m_{Al}=27.\dfrac{1}{15}=1,8\left(g\right)\\ m_{AlCl_3}=\dfrac{1}{15}.133,5=8,9\left(g\right)\)

\(n_{H_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)

PTHH: 2Al + 6HCl --> 2AlCl₃ + 3H₂

          \(\dfrac{1}{15}\)<--------------\(\dfrac{1}{15}\)<-----0,1

=> \(m_{Al}=\dfrac{1}{15}.27=1,8\left(g\right)\)

=> \(m_{AlCl_3}=\dfrac{1}{15}.133,5=8,9\left(g\right)\)

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\\ n_{Al}=n_{AlCl_3}=\dfrac{2}{3}n_{H_2}=\dfrac{2}{3}.\dfrac{2,497}{24,79}=\dfrac{1}{15}\left(mol\right)\\ \Rightarrow m_{Al}=\dfrac{1}{15}.27=1,8\left(g\right);m_{AlCl_3}=\dfrac{1}{15}.133,5=8,9\left(g\right)\)

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

Ta có: \(n_{H_2}=\dfrac{3,7185}{24,79}=0,15\left(mol\right)\)

a, \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,1\left(mol\right)\Rightarrow m_{Al}=0,1.27=2,7\left(g\right)\)

b, \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}n_{H_2}=0,05\left(mol\right)\)

\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=0,05.342=17,1\left(g\right)\)

c, \(n_{H_2SO_4}=n_{H_2}=0,15\left(mol\right)\)

\(\Rightarrow V_{H_2SO_4}=\dfrac{0,15}{1,5}=0,1\left(l\right)=100\left(ml\right)\)

a. \(m_{Al.pứ}=15-9,6=5,4\left(g\right)\)

b. \(\left\{{}\begin{matrix}\%m_{Al}=\dfrac{5,4.100\%}{15}=36\%\\\%m_{Cu}=\dfrac{9,6.100\%}{15}=64\%\end{matrix}\right.\)

c. \(n_{H_2}=\dfrac{3}{2}n_{Al}=\dfrac{3}{2}.\dfrac{5,4}{27}=0,3\left(mol\right)\Rightarrow V_{H_2\left(đkc\right)}=0,3.24,79=7,437\left(l\right)\)

d. \(\%m_{AlCl_3}=\dfrac{0,2.133,5.100\%}{15+200-9,6}=13\%\)

\(a)4Al+3O_2\xrightarrow[]{t^0}2Al_2O_3\\ b)n_{Al_2O_3}=\dfrac{20,4}{102}=0,2mol\\ n_{Al}=\dfrac{0,2.4}{2}=0,4mol\\ m_{Al}=0,4.27=10,8g\)

c) bạn xem lại đề

a) Mg + 2HCl --> MgCl₂ + H₂

b) \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)

PTHH: Mg + 2HCl --> MgCl₂ + H₂

            0,2--->0,4-------------->0,2

=> m_HCl = 0,4.36,5 = 14,6 (g)

c) \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)

d) 

PTHH: CuO + H₂ --t^o--> Cu + H₂O

                       0,2------->0,2

=> m_Cu = 0,2.64 = 12,8 (g)

`Fe + 2HCl -> FeCl_2 + H_2`

`0,2`    `0,4`            `0,2`      `0,2`      `(mol)`

`n_[Fe] = [ 11,2 ] / 56 = 0,2 (mol)`

`a) V_[H_2] = 0,2 . 22, 4= 4,48 (l)`

`b) m_[HCl] = 0,4 . 36,5 = 14,6 (g)`

`c) m_[FeCl_2] = 0,2 . 127 = 25,4 (g)`

pthh  4fe+ 6hcl  -> 2fe2cl3+ 3h2

tính số mol của fe:.....................

tính thể tính khí h2   V=n.22,4=       (l)

khối lượng hcl là   m = n.M=           (g)

khối lg fe2cl3 là   m=n.M =               (g)

chúc bạn học tốt:)))

2Al + 3H2SO4 -- > Al2(SO4)3 + 3H2

0,3      0,45                0,15            0,45

nAl = 8,1 / 27 = 0,3(mol)

\(VH_2=0,45.22,4=10,08\left(g\right)\)

\(m\left(muối\right)=0,15.342=51,3\left(g\right)\)

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

0,45                 0,45

mCu = 0,45 . 64 = 28,8(g)