MÌNH CẦN GẤP NÊN MN LÀM LIỀN NHOA! PLS

Pt:\(Cu+H_2SO_4\xrightarrow[]{X}\)

\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)(1)

a) nH₂ = \(\dfrac{3,36}{22,4}=0,15mol\)

Theo pt (1) nMg = nH₂ = 0,15 mol

=> mMg = 0,15.24 = 3,6g

=> m Cu = 5,2 - 3,6 = 1,6g

b) Theo pt (1) nMgSO₄ = nH₂ = 0,15 mol

=> mMgSO₄ = 0,15.120 = 18g

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

PTHH:
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\) (1)

\(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\) (2)

Theo PT (1): \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,2\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}m_{Al}=0,2.27=5,4\left(g\right)\\m_{Al_2O_3}=15,6-5,4=10,2\left(g\right)\end{matrix}\right.\)

b) \(n_{Al_2O_3}=\dfrac{10,2}{102}=0,1\left(mol\right)\)

Theo PT (1), (2): \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}n_{Al}+n_{Al_2O_3}=0,2\left(mol\right)\)

\(\Rightarrow m_{mu\text{ố}i}=m_{Al_2\left(SO_4\right)_3}=0,2.342=68,4\left(g\right)\)

c) Theo PT (1), (2): \(n_{H_2SO_4}=n_{H_2}+3n_{Al_2O_3}=0,6\left(mol\right)\)

\(\Rightarrow m_{H_2SO_4\left(c\text{ần}.d\text{ùng}\right)}=0,6.98=58,8\left(g\right)\)

\(a.Ca+H_2O\rightarrow Ca\left(OH\right)_2+H_2\\ CaO+H_2O\rightarrow Ca\left(OH\right)_2\\ b.n_{H_2}=n_{Ca}=0,1\left(mol\right)\\ \Rightarrow m_{Ca}=0,1.40=4\left(g\right)\\ \Rightarrow m_{CaO}=9,6-4=5,6\left(g\right)\\ c.n_{CaO}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ \Sigma n_{Ca\left(OH\right)_2}=n_{Ca}+n_{CaO}=0,1+0,1=0,2\left(mol\right)\\ \Rightarrow m_{Ca\left(OH\right)_2}=0,2.74=14,8\left(g\right)\)

\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\\ pthh:Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\) 
           0,1                     0,1                 0,1  
          \(CaO+H_2O\rightarrow Ca\left(OH\right)_2\)(2)
  \(m_{Ca}=0,1.40=4\left(g\right)\\ m_{CaO}=9,6-4=5,6\left(g\right)\) 
\(n_{CaO}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ n_{Ca\left(OH\right)_2\left(2\right)}=n_{CaO}=0,1\left(mol\right)\) 
\(n_{Ca\left(OH\right)_2}=\left(0,1+0,1\right).74=14,8\left(g\right)\)
 

PTHH

a. The h khi H2 la 3,36l

b.Theo PT, so mol cua H2 = so mol cua Ca =so mol cua Ca(OH)2=3,36/22.4=0,15 (mol)

=>m1=0,15.74=11,1 (g)

mCa1=0,15.40=6 (g)

mCa2=17,2-6=11,2 g =>n=0,28 mol

=> m2=0,28.74=20,72 g

KL bazo la m1+m2=31,82 (g)

\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ pthh:Ca+2H_2O\rightarrow Ca\left(OH\right)_2+H_2\) 
           0,3                                        0,3 
 \(m_{Ca}=0,3.40=12\left(g\right)\\ m_{CaO}=30-12=18\left(g\right)\)  
t cho Qùy tím vào dd 
Qùy tím hóa đỏ là axit 
Qùy tím hóa xanh là bazo 
 

\(n_{HCl}=0,4.0,2=0,08\left(mol\right)\\PTHH:\)

\(CuO+2HCl\rightarrow CuCl_2+H_2O\)

x------->2x----->x

\(MgO+2HCl\rightarrow MgCl_2+H_2O\)

y------->2y------>y

Có hệ PT: \(\left\{{}\begin{matrix}80x+40y=2,8\\2x+2y=0,08\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,03\\y=0,01\end{matrix}\right.\)

a)

\(m_{CuO}=80.0,03=2,4\left(g\right)\\ m_{MgO}=40.0,01=0,4\left(g\right)\)

b)

\(\%_{m_{CuO}}=\dfrac{2,4.100\%}{2,8}=85,71\%\\ \%_{m_{MgO}}=\dfrac{0,4.100\%}{2,8}=14,29\%\)

c)

\(m_{CuCl_2}=135x=135.0,03=4,05\left(g\right)\)

a) Gọi \(n_{Cu}=a\left(mol\right)\rightarrow n_{Fe}=\dfrac{3}{2}a=1,5a\left(mol\right)\)

PTHH: 

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

a<------a<------a

\(Fe_3O_4+4H_2\xrightarrow[]{t^o}3Fe+4H_2O\)

0,5a<-----2a<------1,5a

\(\rightarrow80a+0,5a.232=39,2\\ \Leftrightarrow a=0,2\left(mol\right)\)

\(\rightarrow\left\{{}\begin{matrix}m_{CuO}=0,2.80=16\left(g\right)\\m_{Fe_3O_4}=0,5.0,2.232=23,2\left(g\right)\end{matrix}\right.\)

b) \(V_{H_2}=\left(0,2.2+0,2\right).22,4=13,44\left(l\right)\)