\(n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\)

PTHH:

Mg + 2HCl ---> MgCl₂ + H₂

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

=> \(\left\{{}\begin{matrix}V_{H_2}=24,79.0,3=7,437\left(l\right)\\m_{HCl}=0,6.36,5=21,9\left(g\right)\end{matrix}\right.\)

\(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

PTHH: CuO + H₂ --t^o--> Cu + H₂O
LTL: 0,15 < 0,3 => H₂ dư, vậy H₂ khử hết CuO

a, \(n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\)

Mg + 2HCl -----> MgCl₂ + H₂

0,3      0,6                         0,3

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

b, \(m_{HCl}=0,6.36,5=21,9\left(g\right)\)

c, \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

CuO + H₂ -----> Cu + H₂O

Ta có: \(\dfrac{0,15}{1}< \dfrac{0,3}{1}\) ⇒ CuO hết, H₂ dư

\(n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\\ pthh:Mg+2HCl\rightarrow MgCl_2+H_2\) 
             0,3      0,6                         0,3 
\(V_{H_2}=0,3.22,4=6,72l\\ m_{HCl}=0,6.36,5=21,9g\\ n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\\ pthh:CuO+H_2\underrightarrow{t^o}Cu+H_2O\) 
      \(ltl:0,15< 0,3\) 
=> H2 có khử hết CuO

Mg+2HCl->MgCl2+H2

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

n Mg=0,3 mol

=>VH2=0,3.24,79=8,247 l

=>m HCl=0,6.36,5=21,9g

c)H2+CuO-to>Cu+H2O

           0,15-----0,15

n CuO=0,15 mol

=>H2 dư -> CuO dheets 

=>m Cu=0,15.64=9,6g

a, \(2Cu\left(NO_3\right)_2\underrightarrow{t^o}2CuO+4NO_2+O_2\)

b, \(n_{Cu\left(NO_3\right)_2}=\dfrac{28,2}{188}=0,15\left(mol\right)\)

Theo PT: \(\left\{{}\begin{matrix}n_{CuO}=n_{Cu\left(NO_3\right)_2}=0,15\left(mol\right)\\n_{O_2}=\dfrac{1}{2}n_{Cu\left(NO_3\right)_2}=0,075\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow m_{CuO}=0,15.80=12\left(g\right)\)

\(V_{O_2}=0,075.24,79=1,85925\left(l\right)\)

c, Ta có: \(n_{NO_2}+n_{O_2}=\dfrac{6,1975}{24,79}=0,25\left(mol\right)\)

Gọi: n_O2 = x (mol)

Theo PT: \(n_{NO_2}=4n_{O_2}=4x\left(mol\right)\)

⇒ 4x + x = 0,25 ⇒ x = 0,05 (mol)

Theo PT: \(n_{Cu\left(NO_3\right)_2\left(LT\right)}=2n_{O_2}=0,1\left(mol\right)\)

\(\Rightarrow m_{Cu\left(NO_3\right)_2\left(LT\right)}=0,1.188=18,8\left(g\right)\)

Mà: H = 80% \(\Rightarrow m_{Cu\left(NO_3\right)_2\left(TT\right)}=\dfrac{18,8}{80\%}=23,5\left(g\right)\)

nFe = 11,2/56 = 0,2 (mol)

PTHH: Fe + 2HCl -> FeCl2 + H2

Mol: 0,2 ---> 0,4 ---> 0,2 ---> 0,2

VH2 = 0,2 . 22,4 = 4,48 (l)

PTHH: CuO + H2 -> (to) Cu + H2O

Mol: 0,2 <--- 0,2 ---> 0,2

mCu = 0,2 . 64 = 12,8 (g)

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

\(b,n_{Fe}=\dfrac{m}{M}=\dfrac{11,2}{56}=0,2mol\)

\(\Rightarrow n_{H_2}=0,2mol\Rightarrow V_{H_2}=n.22,4=4,48l\)

\(\Rightarrow n_{FeCl_2}=0,2mol\)

\(c,m_{FeCl_2}=n.M=0,2.92,5=18,5g\)

a, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

Ta có: \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

Theo PT: \(n_{H_2}=n_{Cu}=n_{H_2O}=n_{CuO}=0,15\left(mol\right)\)

b, \(m_{Cu}=0,15.64=9,6\left(g\right)\)

\(m_{H_2O}=0,15.18=2,7\left(g\right)\)

c, \(V_{H_2}=0,15.24,79=3,7185\left(l\right)\)

\(PTHH:2Cu+O_2\overset{t^o}{--->}2CuO\)

Bài 9 : 

\(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)

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

0,05--->0,1-------->0,05 

a) \(C_{MddHCl}=\dfrac{0,1}{0,1}=1\left(M\right)\)

b) \(m_{CuCl2}=0,05.135=6,75\left(g\right)\)

c) \(C_{MCuCl2}=\dfrac{0,05}{0,1}0,5\left(M\right)\)

Câu 10 : 

\(n_{FeO}=\dfrac{3,6}{72}=0,05\left(mol\right)\)

\(FeO+2HCl\rightarrow FeCl_2+H_2O\)

0,05-->0,1------->0,05

\(m_{ddHCl}=\dfrac{0,1.36,5}{10\%}100\%=36,5\left(g\right)\)

\(m_{ddspu}=3,6+36,5=40,1\left(g\right)\)

\(C\%_{FeCl2}=\dfrac{0,05.127}{40,1}.100\%=15,84\%\)

Câu 10 :

\(n_{FeO}=\dfrac{3,6}{72}=0,05\left(mol\right)\)

PTHH :

\(FeO+2HCl\rightarrow FeCl_2+H_2O\)

0,05      0,1           0,05       0,05

\(m_{ddHCl}=\dfrac{0,1.36,5.100}{10}=36,5\left(g\right)\)

\(C\%_{FeCl_2}=\dfrac{0,05.127}{\left(3,6+36,5\right)}.100\%=15,84\%\)

\(2KClO_3\xrightarrow[xtMnO_2]{t^o}2KCl+3O_2\) 
\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\\ H_2+CuO\underrightarrow{400^oC}H_2O+Cu\\ CaO+H_2O\rightarrow Ca\left(OH\right)_2\)