\(a) Fe + 2HCl \to FeCl_2 + H_2\\ b) n_{FeCl_2} = n_{Fe} =\dfrac{11,2}{56} = 0,2(mol)\\ m_{FeCl_2} = 0,2.127 = 25,4(gam)\\ c) n_{H_2} = n_{Fe} = 0,2(mol)\Rightarrow V_{H_2} = 0,2.22,4 = 4,48(lít)\\ d) n_{HCl} = 2n_{Fe} = 0,4(mol)\\ C\%_{HCl} = \dfrac{0,4.36,5}{300}.100\% = 4,867\%\)

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

A. \(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right)\)

Theo PTHH: \(n_{H_2}=n_{Fe}=0,4\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,4.22,4=8,96\left(l\right)\)

B. Theo PTHH: \(n_{FeCl_2}=n_{Fe}=0,4\left(mol\right)\)

\(m_{FeCl_2}=0,4.127=50,8\left(g\right)\)

C. Nồng độ mol:

\(C_M=\dfrac{0,4}{0,3}=1,3\left(M\right)\)

Fe + 2HCl -> FeCl2 + H2
nFe = 5,6/56 = 0,1 mol
=>nH2 = 0,1 mol
=> VH2= 0,1*22,4= 2,24 lít

\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)

PTHH: Fe + 2HCl ---> FeCl₂ + H₂

          0,1-->0,2------------------>0,1

=> \(\left\{{}\begin{matrix}m_{ddHCl}=\dfrac{0,2.36,5}{15\%}=\dfrac{146}{3}\left(g\right)\\V_{H_2}=0,1.22,4=4,48\left(l\right)\end{matrix}\right.\)

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

b) nFe = \(\dfrac{11,2}{56}=0,2mol\)

Theo pt: nH₂ = nFe = 0,2 mol

=> VH₂ = 0,2.22,4 = 4,48lit

c) Theo pt: nHCl = 2nFe = 0,4 mol

=> mHCl = 0,4.36,5 = 14,6 g

=> C% = \(\dfrac{14,6}{73}.100\%=20\%\)

a) Pt: $Fe+2HCl\to FeC{}^{}+{}^{}$

b) nFe = \(\dfrac{11,2}{56}=0,2mol\)

Theo pt: nH₂ = nFe = 0,2 mol

=> VH₂ = 0,2.22,4 = 4,48lit

c) Theo pt: nHCl = 2nFe = 0,4 mol

=> mHCl = 0,4.36,5 = 14,6 g

=> \(C\%=\dfrac{14,6}{73}.100\%=20\%\)

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

b, Ta có: \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)

Theo PT: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)

c, Theo PT: \(n_{HCl}=2n_{Fe}=0,4\left(mol\right)\)

\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)

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

\(1mol\)     \(2mol\)                 \(1mol\)

\(0,2mol\)    \(0,4mol\)          \(0,2mol\)

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

\(V_{H_2}=n.22,4=0,2.22,4=4,48\left(l\right)\)

\(m_{HCl}=n.M=0,4.=14,6\left(g\right)\)

a) nFe=0,1(mol); nHCl=0,4(mol)

PTHH: Fe + 2 HCl -> FeCl2 + H2

Ta có: 0,1/1 < 0,4/2

=> Fe hết, HCl dư, tish theo nFe.

b) nH2=nFeCl2=Fe=0,1(mol)

=> V(H2,đktc)=0,1.22,4=2,24(l)

c) mFeCl2=127.0,1=12,7(g)

a) nFe=0,1(mol); nHCl=0,4(mol) PTHH: Fe + 2 HCl -> FeCl2 + H2 Ta có: 0,1/1 < 0,4/2 => Fe hết, HCl dư, tish theo nFe. b) nH2=nFeCl2=Fe=0,1(mol) => V(H2,đktc)=0,1.22,4=2,24(l) c) mFeCl2=127.0,1=12,7(g)

Bài 1:

1) Fe + 2HCl --> FeCl₂ + H₂

2) \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)

PTHH: Fe + 2HCl --> FeCl₂ + H₂
_____0,3--------------->0,3--->0,3

=> n_H2 = 0,3.22,4 = 6,72(l)

3) m_FeCl2 = 0,3.127=38,1(g)

Bài 2

1) 2Al + 3H₂SO₄ --> Al₂(SO₄)₃ + 3H₂

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

PTHH: 2Al + 3H₂SO₄ --> Al₂(SO₄)₃ + 3H₂

______0,2<----------------------------------0,3

=> m_Al = 0,2.27 = 5,4(g)

\(Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\\ n_{H_2}=n_{Fe}=0,25\left(mol\right)\\ V_{H_2}=0,25.22,4=5,6\left(l\right)\\ n_{HCl}=2n_{Fe}=0,5\left(mol\right)\\ m_{HCl}=0,5.36,5=18,25\left(g\right)\)