\(a,n_{H_2}=\dfrac{14,874}{24,79}=0,6mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{H_2}=n_{Fe}=0,6mol\\ m_{Fe}=0,6.56=33,6g\\ b.n_{HCl}=0,6.2=1,2mol\\ m_{HCl}=1,2.36,5=43,8g\)

\(n_{H_2}=\dfrac{14,874}{24,79}=0,6\left(mol\right)\)

PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

a, \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,4\left(mol\right)\Rightarrow m_{Al}=0,4.27=10,8\left(g\right)\)

b, \(n_{HCl}=2n_{H_2}=1,2\left(mol\right)\Rightarrow m_{HCl}=1,2.36,5=43,8\left(g\right)\)

\(n_{H_2}=\dfrac{14,874}{24,79}=0,6\left(mol\right)\)

PTHH :

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)

0,4        1,2         0, 4          0,6

\(m_{Al}=0,4.27=10,8\left(g\right)\)

\(m_{HCl}=1,2.36,5=43,8\left(g\right)\)

a)

$n_{Fe} = \dfrac{14}{56} = 0,25(mol)$

$Fe + 2HCl \to FeCl_2 + H_2$

b) $n_{HCl} = 2n_{Fe} = 0,5(mol) \Rightarrow m_{HCl} = 0,5.36,5 = 18,25(gam)$

c) $n_{H_2} = n_{Fe} = 0,25(mol) \Rightarrow V_{H_2} = 0,25.22,4 = 5,6(lít)$

Ta có: \(n_{H_2}=\dfrac{74,37}{24,79}=3\left(mol\right)\)

PT: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)

a, \(n_{Al}=\dfrac{2}{3}n_{H_2}=2\left(mol\right)\)

\(\Rightarrow m_{Al}=2.27=54\left(g\right)\)

b, \(n_{H_2SO_4}=n_{H_2}=3\left(mol\right)\)

\(\Rightarrow m_{H_2SO_4}=3.98=294\left(g\right)\)

\(Fe + 2HCl \to FeCl_2 + H_2\\ n_{Fe} = n_{FeCl_2} = n_{H_2} = \dfrac{8,96}{22,4} = 0,4(mol)\\ m_{Fe} = 0,4.56 = 22,4(gam)\\ m_{FeCl_2} = 0,4.127 = 50,8(gam)\)

\(n_{H_2}=\dfrac{8.96}{22.4}=0.4\left(mol\right)\)

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

\(n_{Fe}=n_{FeCl_2}=n_{H_2}=0.4\left(mol\right)\)

\(m_{Fe}=0.4\cdot56=22.4\left(g\right)\)

\(m_{FeCl_2}=0.4\cdot127=50.8\left(g\right)\)

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

Fe + 2HCl → FeCl₂ + H₂

0,2.....0,4.........0,2........0,2..............(mol)

Vậy :

V = 0,2.22,4 = 4,48(lít)

\(m_{FeCl_2} = 0,2.127=25,4(gam)\)

\(m_{HCl} = 0,4.36,5 = 14,6(gam)\)

PTHH: Fe+2HCl → FeCl2+H2

a, nFe=m:M=11,2:56=0,2 mol

Theo PTHH, nFe=nH2=0,2 mol

VH2=n.22,4=0,2.22,4=4,48 lít

b, Theo PTHH, nFeCl2=nFe=0,2

mFeCl2=n.M=0,2.127=25,4 g 

c,

Theo PTHH, nHCl=2nFe=0,4 mol

mHCl=n.M=0,4.36,5=14,6 g

Fe + 2HCl \(\rightarrow FeCl_2+H_2\)

a) nFe = \(\dfrac{5,6}{56}=0,1mol\)

Theo pt nH₂ = nFe = 0,1 mol

=> VH₂ = 0,1.22,4 = 2,24 lít

b) Theo pt: nFeCl₂ = nFe = 0,1 mol

=> mFeCl₂ = 0,1.127 = 12,7g

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

=> mHCl = 0,2.36,5 = 7,3g

a,\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right);n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: Fe + 2HCl → FeCl₂ + H₂

Mol:    0,15     0,3

Ta có: \(\dfrac{0,2}{1}>\dfrac{0,15}{1}\) ⇒ H₂ pứ hết,Fe dư

\(V_{H_2}=3,36\left(l\right)\) (đề cho)

b, ko tính đc k/lg dd ,chỉ tính đc thể tích dd

\(V_{ddHCl}=\dfrac{0,2}{1}=0,2\left(l\right)=200\left(ml\right)\)

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

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