a) Gọi KL cần tìm là X 
n_HCl=\(\frac{5,6}{22,4}\)=0,25 
PTHH: X + HCl \(\rightarrow\) XCl₂ + H₂
           0,25 0,5      0,25 0,25 
\(\Rightarrow\)m_X = \(\frac{16.25}{0,25}\)=65g ( Zn ) 
b) mHCl= \(0,5.36,5\)=18.25g 
mdd= \(\frac{18.25}{0,1825}\)=100g 
Cm = \(\frac{0,5}{\frac{0,1}{0,2}}\)=6 mol/l 
c) C% = 0,25.(65+71)/(100+16,25-0,5).100=29.73% 

a) Gọi kl cần tìm là X
nHCl= 5.6/22.4=0.25
PTHH: X + HCl -> XCl2 + H2
0.25 0.5 0.25 0.25
=>mX = 16.25/0.25=65g ( Zn )
b) mHCl= 0.5*36.5=18.25g
mdd= 18.25/0.1825=100g
Cm = 0.5/(0.1/1.2)=6 mol/l (lơn z tar)
c) C% = 0.25*(65+71)/(100+16.25-0.5)*100=29.73%

\(m_{dd.HCl}=1,08.150=162\left(g\right)\)

\(n_{CO_2}=\dfrac{3,7185}{24,79}=0,15\left(mol\right)\)

\(RCO_3+2HCl\rightarrow RCl_2+H_2O+CO_2\)

0,15<----------------0,15<-----------0,15

Có: \(R+60=\dfrac{12,6}{0,15}\Rightarrow R=24\left(g/mol\right)\)

a. Kim loại R là Magie (Mg)

b. \(C\%_{MgCl_2}=\dfrac{0,15.95.100\%}{12,6+162-0,15.44}=8,48\%\)

c. \(n_{AgCl}=\dfrac{53,8125}{143,5}=0,375\left(mol\right)\)

\(MgCl_2+2AgNO_3\rightarrow2AgCl+Mg\left(NO_3\right)_2\)

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

Vì \(n_{AgCl}=0,3\left(mol\right)< 0,375\left(mol\right)_{theo.đề}\) \(\Rightarrow\) HCl dư

\(HCl+AgNO_3\rightarrow AgCl+HNO_3\)

0,075<------------0,075

\(CM_{HCl.đem.dùng}=\dfrac{0,075}{0,15}=0,5M\)

\(n_{CO2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

Pt : \(MCO_3+H_2SO_4\rightarrow MgSO_4+CO_2+H_2O|\)

           1              1                 1            1         1

          0,1           0,1                            0,1       0,1

\(n_{MCO3}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)

Có : \(0,1.\left(M=60\right)=8,4\)

               \(\left(M+60\right)=84\)

              \(M=84-60=24\left(dvc\right)\)

          Vậy kim loại M là magie

\(n_{H2SO4}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)

⇒ \(m_{H2SO4}=0,1.98=9,8\left(g\right)\)

\(m_{ddH2SO4}=\dfrac{9,8.100}{12,25}=80\left(g\right)\)

\(n_{MgSO4}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)

⇒ \(m_{MgSO4}=0,1.120=12\left(g\right)\)

\(m_{ddspu}=8,4+80=88,4\left(g\right)\)

\(C_{MgSO4}=\dfrac{12.100}{88,4}=13,57\)⁰/₀

 Chúc bạn học tốt

\(a)n_{H_2}=\dfrac{4,958}{24,79}=0,2\left(mol\right)\\ 2Al+6HCl\rightarrow2AlCl_3+3H_2\left(1\right)\\ Fe+2HCl\rightarrow FeCl_2+H_2\left(2\right)\\ n_{Al}=a;n_{Fe}=b\\ \left\{{}\begin{matrix}1,5a+b=0,2\\27a+56b=5,5\end{matrix}\right.\\ a=0,1\\ b=0,05\\ \%_{Al}=\dfrac{0,1.27}{5,5}\cdot100=49\%\\ \%_{Fe}=100-49=51\%\\ b)n_{HCl\left(1\right)_{ }}=0,1\cdot\dfrac{6}{2}=0,3\left(mol\right)\\ n_{HCl\left(2\right)}=0,05.2=0,1\left(mol\right)\\ n_{HCl}=0,3+0,1=0,4\left(mol\right)\\ C_{M_{HCl}}=\dfrac{0.4}{0,5}=0,8M\)

\(n_{Zn}=\dfrac{4,55}{65}=0,07(mol)\\ Zn+2HCl\to ZnCl_2+H_2\\ a,n_{HCl}=0,14(mol)\\ \Rightarrow C_{M_{HCl}}=\dfrac{0,14}{0,2}=0,7M\\ b,n_{H_2}=0,07(mol)\\ \Rightarrow V_{H_2}=0,07.22,4=1,568(l)\\ c,n_{ZnCl_2}=0,07(mol)\\ \Rightarrow m_{ZnCl_2}=0,07.136=9,52(g)\\ c,ZnCl_2+2AgNO_3\to 2AgCl\downarrow+Zn(NO_3)_2\)

\(m_{dd_{ZnCl_2}}=200.0,8+4,55-0,07.2=164,41(g)\\ n_{AgCl}=0,14(mol);n_{Zn(NO_3)_2}=0,07(mol)\\ \Rightarrow C\%_{Zn(NO_3)_2}=\dfrac{0,07.189}{164,41+200-0,14.143,5}.100\%=3,84%\)

a,Gọi hỗn hợp 2 kim loại là R

n_H2 =\(\dfrac{3,36}{22,4}\)= 0,15 mol

PTHH: R + HCL\(\rightarrow\) RCL+\(\dfrac{1}{2}\)H2

TBR: 0,3 \(\leftarrow\)0,15

M_R= \(\dfrac{8,5}{0,3}\)=28,3

\(\Rightarrow\) hai kim loại đó là Na và K

b,