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

áp dụng định luật bảo toàn khối lượng ta có

\(m_{Al}+m_{H_2SO_4}=m_{Al_2\left(SO_4\right)_3}+m_{H_2}\\ =>5,4+29,4=34,2+m_{H_2}\\ =>m_{H_2}=0,6\left(g\right)\)

PTHH:2Al+3H2​SO4​−>Al2​(SO4​)3​+3H2​

áp dụng định luật bảo toàn khối lượng ta có

���+��2��4=���2(��4)3+��2=>5,4+29,4=34,2+��2=>��2=0,6(�)mAl​+mH2​SO4​​=mAl2​(SO4​)3​​+mH2​​=>5,4+29,4=34,2+mH2​​=>mH2​​=0,6(g)

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

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

            0,2--->0,3-------->0,1----------->0,3

b) `V_{H_2} = 0,3.22,4 = 6,72 (l)`

c) `m_{H_2SO_4} = 0,3.98 = 29,4 9g)`

d) \(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)

PTHH: \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)

Xét tỉ lệ: 0,2 < 0,3 => H₂ dư

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

Làm gộp các phần còn lại

Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}n_{Al_2\left(SO_4\right)_3}=0,1mol\\n_{H_2SO_4}=n_{H_2}=0,3mol\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\\m_{Al_2\left(SO_4\right)_3}=0,1\cdot342=34,2\left(g\right)\\m_{H_2SO_4}=0,3\cdot98=29,4\left(g\right)\end{matrix}\right.\) 

Theo định luật bảo toàn khối lượng ta có:

\(m_{Al}+m_{H_2SO_4}=m_{Al_2\left(SO_4\right)_3}+m_{H_2}\)

=> \(m_{Al_2\left(so_4\right)_3}=\left(m_{Al}+m_{H_2SO_4}\right)-m_{H_2}\\ =>m_{Al\left(SO_4\right)_3}=\left(54+294\right)-6=342\left(g\right)\)

PTHH: 2Al + 3H₂SO₄ ===> Al₂₍SO₄)₃ + 3H₂

Áp dụng định luật bảo toàn khối lượng, ta có:

\(m_{Al}+m_{H2SO4}=m_{Al2\left(SO4\right)3}+m_{H2}\)

\(\Leftrightarrow m_{Al2\left(SO4\right)3}=m_{Al}+m_{H2SO4}-m_{H2}\)

\(\Leftrightarrow m_{Al2\left(SO4\right)3}=54+294-6=342\left(gam\right)\)

Vậy khối lượng nhôm sunfat thu được là 342 gam

Ta có PT:

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

=> 54 + 294 = Al₂(SO₄)₃ + 6

348 = Al₂(SO₄)₃ + 6

Al₂(SO₄)₃ = 342

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

0,1----------------------0,075----0,15

n H2=0,15 mol

=>mAl=0,1.27=2,7g

=>m Al2(SO4)3=0,075.342=25,65g

a) PTHH: \(2Al+3H_2SO_2\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

b) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

\(n_{Al}=\dfrac{2}{3}.0,15=0,1\left(mol\right)\)

\(m_{Al}=0,1.27=2,7\left(g\right)\)

c) \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\)

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

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

0,1----------------------0,075----0,15

n H2=0,15 mol

=>mAl=0,1.27=2,7g

=>m Al2(SO4)3=0,075.342=25,65g

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

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

0,2                                              0,3    ( mol )

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

c.\(n_{CuO}=\dfrac{m_{CuO}}{M_{CuO}}=\dfrac{32}{80}=0,4mol\)

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

 0,4  <  0,3                          ( mol )

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

\(m_A=m_{CuO\left(du\right)}+m_{Cu}=\left[\left(0,4-0,3\right).80\right]+\left(0,3.64\right)=8+19,2=27,2g\)

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

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

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

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

Sửa đề thành 0,54 gam Al cho số mol đẹp bạn nhé!

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

Ta có: \(n_{Al}=\dfrac{0,54}{27}=0,02\left(mol\right)\)

Theo PT: \(\left\{{}\begin{matrix}n_{H_2SO_4}=n_{H_2}=\dfrac{3}{2}n_{Al}=0,03\left(mol\right)\\n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}n_{Al}=0,01\left(mol\right)\end{matrix}\right.\)

a, Ta có: \(n_{H_2}=0,03.22,4=0,672\left(l\right)\)

b, \(m_{H_2SO_4}=0,03.98=2,94\left(g\right)\)

c, \(m_{Al_2\left(SO_4\right)_3}=0,01.342=3,42\left(g\right)\)

Bạn tham khảo nhé!

a) \(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\)

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

            0,3------------------>0,15----->0,45

=> \(m_{Al_2\left(SO_4\right)_3}=0,15.342=51,3\left(g\right)\)

b)

PTHH: 2H₂ + O₂ --t^o-->2H₂O

          0,45->0,225

=> \(V_{O_2}=0,225.22,4=5,04\left(l\right)\)

=> V_kk = 5,04 : 20% = 25,2 (l)

\(n_{Al}=\dfrac{8,1}{27}=0,3\left(mol\right)\\ pthh:2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\) 
          0,3                         0,15               0,45 

\(m_{Al_2\left(SO_4\right)_3}=0,15.342=51,3\left(g\right)\\ V_{H_2}=0,45.22,4=10,08\left(l\right)\) 
\(pthh:2H_2+O_2\underrightarrow{t^o}2H_2O\) 
            0,45   0,225 
\(V_{KK}=\left(0,225.22,4\right):20\%=25,2\left(l\right)\)

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

b. Áp dụng định luật bảo toàn khối lượng, ta có:

\(m_{Al}+m_{H_2SO_4}=m_{Al_2\left(SO_4\right)_3}+m_{H_2}\)

\(\Leftrightarrow m_{Al_2\left(SO_4\right)_3}=m_{Al}+m_{H_2SO_4}-m_{H_2}=5,4+29,4-0,6=34,2\left(g\right)\)