a)

$Fe + 2HCl \to FeCl_2 + H_2$

b) Theo PTHH : $n_{Fe} = n_{H_2} = \dfrac{3,36}{22,4} = 0,15(mol)$
$m_{Fe} = 0,15.56 = 8,4(gam)$

c) $n_{HCl} = 2n_{H_2} = 0,3(mol)$
$\Rightarrow C_{M_{HCl}} = \dfrac{0,3}{0,05} = 6M$

d) $2NaOH + H_2SO_4 \to Na_2SO_4 + 2H_2O$

$n_{H_2SO_4} = \dfrac{1}{2}n_{NaOH} = 0,25(mol)$

$m_{dd\ H_2SO_4} = \dfrac{0,25.98}{20\%} = 122,5(gam)$

$V_{dd\ H_2SO_4} = \dfrac{122,5}{1,14} = 107,5(ml)$

\(n_{H2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)

        1         2              1          1

      0,15     0,3                       0,15

\(n_{Fe}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)

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

\(n_{HCl}=\dfrac{0,15.2}{1}=0,3\left(mol\right)\)

50ml = 0,05l

\(C_{M_{HCl}}=\dfrac{0,3}{0,05}=6\left(M\right)\) 

 Chúc bạn học tốt

\(n_{H2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

a) Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)

            1         2             1          1

          0,15     0,3                      0,15

b) \(n_{Fe}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)

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

c) \(n_{HCl}=\dfrac{0,15.2}{1}=0,3\left(mol\right)\)

50ml = 0,05l

\(C_{M_{ddHCl}}=\dfrac{0,3}{0,05}=6\left(M\right)\)

 Chúc bạn học tốt

\(Fe+H_2SO_4 \to FeSO_4+H_2\\ n_{H_2}=0,15(mol)\\ a/\\ n_{Fe}=n_{H_2}=0,15(mol)\\ m_{Fe}=0,15.56=8,4(g)\\ b/\\ n_{H_2SO_4}=n_{H_2}=0,15(mol)\\ CM_{H_2SO_4}=\dfrac{0,15}{2}=0,75M c/\\ n_{FeSO_4}=n_{H_2}=0,15(mol)\\ CM_{FeSO_4}=\dfrac{0,15}{0,2}=0,75M\\\)

nH2=3.36/22.4=0.15 mol

a) PT: Fe + 2HCl ----> FeCl2 + H2

          0.15    0.3                       0.15

b)mFe=0.15*56=8.4g

c)CM_HCl= 0.3*0.05=6 M

Chúc em học tốt!!!

Fe+2HCl->FeCl2+H2

nH2=0.15(mol)

Theo pthh nFe=nH2->nFe=0.15(mol)

mFe phản ứng:0.15*56=8.4(g)

nHCl=2nH2->nHCl=0.3(mol)

CM=0.3:0.05=6 M

a, Fe + 2HCl --> FeCl2 + H2
 b, n_H2=0,15 (mol)
n_H2=n_Fe=> n_Fe= 0,15(mol) 
=> m_Fe=0,15.56=8,4g
c,n_H2=\(\frac{1}{2}\)n_HCl => n_HCl= 0,15.2=0,3 (mol)
đổi: 500lm=0,5 lit 
=> CM_HCl=\(\frac{0,3}{0,5}\)=0,6 M 

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

PTHH: Fe + 2HCl --> FeCl₂ + H₂

____0,15<--0,3<-------------0,15

=> m_Fe = 0,15.56 = 8,4 (g)

b) \(C_{M\left(ddHCl\right)}=\dfrac{0,3}{0,05}=6M\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=\dfrac{9,9161}{24,79}\approx0,4\left(mol\right)\\ b,m_{Fe}\approx0,4.56\approx22,4\left(g\right)\\ c,n_{HCl}\approx0,4.2\approx0,8\left(mol\right)\\ C_{MddHCl}\approx\dfrac{0,8}{0,25}\approx3,2\left(M\right)\)

\(a)Fe+2HCl\rightarrow FeCl_2+H_2\\ b)n_{H_2}=\dfrac{9,9161}{24,79}\approx0,4mol\\ n_{Fe}=n_{H_2}=0,4mol\\ m_{Fe}=0,4.56=22,4g\\ c)n_{HCl}=2n_{H_2}=2.0,4=0,8mol\\ 250ml=0,25l\\ C_{M_{HCl}}=\dfrac{0,8}{0,25}=3,2M\)

a) \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

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

Theo PTHH: \(n_{Fe}=n_{H_2}=0,15\left(mol\right)\)

\(\Rightarrow m_{Fe}=0,15\cdot56=8,4\left(g\right)\)

c) Theo PTHH: \(n_{H_2SO_4}=n_{H_2}=0,15\left(mol\right)\)

\(V_{H_2SO_4}=50ml=0,05\left(l\right)\)

\(\Rightarrow C_{M,H_2SO_4}=\dfrac{n_{H_2SO_4}}{V_{H_2SO_4}}=\dfrac{0,15}{0,05}=3M\)