a) $n_{H_2SO_4} = \dfrac{44,1}{98} = 0,45(mol)$

$2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$

Theo PTHH : 

$n_{Al} = \dfrac{2}{3}n_{H_2SO_4} = 0,3(mol)$
$m_{Al} = 0,3.27 = 8,1(gam)$

b) $n_{H_2} = n_{H_2SO_4} = 0,45(mol)$
$\Rightarrow V_{H_2} = 0,45.22,4 =1 0,08(lít)$

c)

Cách 1 : $n_{Al_2(SO_4)_3} = \dfrac{1}{3}n_{H_2SO_4} = 0,15(mol)$
$\Rightarrow m_{Al_2(SO_4)_3} = 0,15.342 = 51,3(gam)$

Cách 2 : Bảo toàn khối lượng, $m_{Al_2(SO_4)_3} = 8,1 + 44,1 - 0,45.2 = 51,3(gam)$

Bài 4 câu a đề là thể tích H2 nha bạn

a)\(Fe2O3+3H2-->2Fe+3H2O\)

\(n_{Fe2O3}=\frac{12}{160}=0,075\left(mol\right)\)

\(n_{H2}=3n_{Fe2O3}=0,225\left(mol\right)\)

\(V_{H2}=0,225.22,4=5,04\left(l\right)\)

b)\(n_{Fe}=2n_{Fe2O3}=0,15\left(mol\right)\)

\(m_{Fe}=0,15.56=8,4\left(g\right)\)

Bài 6

a)\(Zn+H2SO4-->ZnSO4+H2\)

\(n_{Zn}=\frac{19,5}{65}=0,3\left(mol\right)\)

\(n_{ZnSO4}=n_{Zn}=0,3\left(mol\right)\)

\(m_{ZnSO4}=0,3.162=48,3\left(g\right)\)

b)\(n_{H2}=n_{Zn}=0,3\left(mol\right)\)

\(V_{H2}=0,3.22,4=6,72\left(l\right)\)

a)Fe2O3+3H2−−>2Fe+3H2O

0,075-------0,225---0,15 mol

nFe2O3=12/160=0,075(mol)

VH2=0,225.22,4=5,04(l)

b)

mFe=0,15.56=8,4(g)

Bài 6

a)Zn+H2SO4−−>ZnSO4+H2

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

nZn=19,5/65=0,3(mol)

mZnSO4=0,3.162=48,3(g)

b)

=>VH2=0,3.22,4=6,72(l)

a. PTHH : Fe + 2HCl -> FeCl₂ + H₂ 

b. Ta có PTHH : Fe + 2HCl -> FeCl₂ + H₂ 

Theo pt             1mol  2mol

Theo đề          0,1mol->0,2mol

Khối lượng HCl đã phản ứng :

\(m_{HCl}\) = \(n_{HCl}\) . \(M_{HCl}\)

=> \(m_{HCl}\) = 0,2 . 36,5

=>\(m_{HCl}\) = 7,3 (g)

a) \(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)

PTHH: 2Al + 6HCl --> 2AlCl₃ + 3H₂

             0,4------------>0,4---->0,6

=> \(V_{H_2}=0,6.22,4=13,44\left(l\right)\)

b) 

\(m_{AlCl_3}=0,4.133,5=53,4\left(g\right)\)

c)

PTHH: CuO + H₂ --t^o--> Cu + H₂O

                       0,6------>0,6

=> m_Cu = 0,6.64 = 38,4 (g)

`n_[Al]=[10,8]/27=0,4(mol)`

`2Al + 6HCl -> 2AlCl_2 + 3H_2 \uparrow`

`0,4`                              `0,4`     `0,6`      `(mol)`

`a)V_[H_2]=0,6.22,4=13,44(l)`

`b)m_[AlCl_2]=0,4.98=39,2(g)`

`c)`

`H_2 + CuO` $\xrightarrow{t^o}$ `Cu + H_2 O`

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

`=>m_[Cu]=0,4.64=25,6(g)`

\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

PTHH: Zn + 2HCl ---> FeCl₂ + H₂

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

=> \(\left\{{}\begin{matrix}m=0,3.65=19,5\left(g\right)\\m_{muối}=0,3.136=40,8\left(g\right)\\V_{ddHCl}:thiếu.C_M\end{matrix}\right.\)

\(n_{Fe_2O_3}=\dfrac{32}{160}=0,2\left(mol\right)\)

PTHH: Fe₂O₃ + 3H₂ --t^o--> 2Fe + 3H₂O
LTL: \(0,2>\dfrac{0,3}{3}\) => Fe₂O₃ dư

Theo pthh: n_{Fe2O3 (pư)} = \(\dfrac{1}{3}n_{H_2}=\dfrac{1}{3}.0,3=0,1\left(mol\right)\)

                  n_Fe = \(\dfrac{2}{3}n_{H_2}=\dfrac{2}{3}.0,3=0,2\left(mol\right)\)

=> m_{chất rắn} = 0,1.160 + 0,2.56 = 27,2 (g)

Zn+2HCl->ZnCl2+H2

0,3---0,6----0,3----0,3

n H2=0,3 mol

=>m Zn=0,3.65=19,5g

=>m muối=0,3.136=40,8g

c) thiếu đề

d)

Fe2O3+3H2-to>2Fe+3H2O

               0,3------0,2

n Fe2O3=0,2 mol

=>Fe2O3 dư

=>m cr=0,2.56+0,1.160=27,2g

a) \(n_{H_2SO_4}=\dfrac{58,8}{98}=0,6\left(mol\right)\)

\(PTHH\): \(2Al+3H_2SO_4->Al_2\left(SO_4\right)_3+3H_2\)

______0,4<------0,6------------------------->0,6

=> V_H2 = 0,6.22,4 = 13,44 (l)

b) m_Al = 0,4.27 = 10,8(g)

\(n_{H_2SO_4}=\dfrac{58.8}{98}=0.6\left(mol\right)\)

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

\(0.4........0.6..................................0.6\)

\(V_{H_2}=0.6\cdot22.4=13.44\left(l\right)\)

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

\(n_{Zn}=\dfrac{6.5}{65}=0,1\left(mol\right)\)

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

1          2             1             1

0,1      0,2                         0,1

b, \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)

c, \(V_{H_2}=0,1.24,79=2,479\left(l\right)\)

d, PTHH : \(H_2+CuO\rightarrow Cu+H_2O\)

                  1         1          1         1

                  0,1      0,1

\(m_{CuO}=0,1.\left(64+16\right)=8\left(g\right)\)

Ta có: \(n_{H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)

a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)

_____0,05__0,1____________0,05 (mol)

b, m_Fe = 0,05.56 = 2,8 (g)

c, m_HCl = 0,1.36,5 = 3,65 (g)

\(\Rightarrow m_{ddHCl}=\dfrac{3,65}{10\%}=36,5\left(g\right)\)

Bạn tham khảo nhé!

\(n_{H_2}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(0.05......0.1...................0.05\)

\(m_{Fe}=0.05\cdot56=2.8\left(g\right)\)

\(m_{dd_{HCl}}=\dfrac{0.1\cdot36.5\cdot100}{10}=36.5\left(g\right)\)