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

Bảo toàn Hidro: \(n_{HCl}=2n_{H_2}=2\cdot\dfrac{3,36}{22,4}=0,3\left(mol\right)\) \(\Rightarrow C_{M_{HCl}}=\dfrac{0,3}{0,5}=0,6\left(M\right)\)

\(\Rightarrow\) Chọn A

A. 0,6M

\(Fe + 2HCl \rightarrow FeCl_2 + H_2\)

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

Theo PTHH

\(n_{HCl} = 2n_{H_2}= 2 . 0,15 = 0,3 mol\)

C_M\(HCl\)=\(\dfrac{0,3}{0,5}= 0,6M\)

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

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

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

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

\(n_{HCl}=2n_{H_2}=0,3\left(mol\right)\)

\(50ml=0,05l\)

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

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

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

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, \(Fe+2HCl\rightarrow FeCl_2+H_2\)

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

Theo PT: \(n_{Fe}=n_{FeCl_2}=n_{H_2}=0,3\left(mol\right)\Rightarrow m_{Fe}=0,3.56=16,8\left(g\right)\)

b, \(n_{HCl}=2n_{H_2}=0,6\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{0,6}{0,15}=4\left(M\right)\)

c, \(FeCl_2+2NaOH\rightarrow2NaCl+Fe\left(OH\right)_2\)

Theo PT: \(n_{NaOH}=2n_{FeCl_2}=0,6\left(mol\right)\)

\(\Rightarrow V_{NaOH}=\dfrac{0,6}{1}=0,6\left(l\right)=600\left(ml\right)\)

\(a.Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe,pư}=n_{FeCl_2}=n_{H_2}=\dfrac{6,72}{22,4}=0,3mol\\ m_{Fe,pư}=0,3.56=16,8g\\ b.n_{HCl}=0,3.2=0,6mol\\ C_{M_{HCl}}=\dfrac{0,6}{0,15}=4M\\ c.2NaOH+FeCl_2\rightarrow Fe\left(OH\right)_2+2NaCl\\ n_{NaOH}=0,3.2=0,6mol\\ V_{ddNaOH}=\dfrac{0,6}{1}=0,6l=600ml\)

a, \(Fe+2HCl\rightarrow FeCl_2+H_2\)

b, \(n_{H_2}=\dfrac{9,916}{24,79}=0,4\left(mol\right)\)

\(n_{Fe}=n_{H_2}=0,4\left(mol\right)\Rightarrow m_{Fe}=0,4.56=22,4\left(g\right)\)

c, \(n_{HCl}=2n_{H_2}=0,8\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{0,8}{0,2}=4\left(M\right)\)

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

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

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

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