\(n_{Fe}=\dfrac{22,4}{56}=0,4\left(mol\right);n_{H_2SO_4}=\dfrac{24,5}{98}=0,25\left(mol\right)\\ PTHH:Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ Vì:\dfrac{0,4}{1}>\dfrac{0,25}{1}\Rightarrow Fe.dư\\ n_{H_2}=n_{Fe\left(p.ứ\right)}=n_{H_2SO_4}=0,25\left(mol\right)\\ a,V_{H_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\\ b,n_{Fe\left(dư\right)}=0,4-0,25=0,15\left(g\right)\\ m_{Fe\left(dư\right)}=0,14.56=8,4\left(g\right)\)

`n_[Fe]=[11,2]/56=0,2(mol)`

`n_[HCl]=0,3.2=0,6(mol)`

`Fe + 2HCl -> FeCl_2 + H_2 \uparrow`

`0,2`   `0,4`             `0,2`     `0,2`         `(mol)`

`a)` Ta có:`[0,2]/1 < [0,6]/2`

    `=>HCl` dư

`=>V_[H_2]=0,2.22,4=4,48(l)`

`b)HCl` còn dư sau p/ứ

`=>m_[HCl(dư)]=(0,6-0,4).36,5=7,3(g)`

`c)C_[M_[FeCl_2]]=[0,2]/[0,3]~~0,67(M)`

  `C_[M_[HCl(dư)]=[0,6-0,4]/[0,3]~~0,67(M)`

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

\(n_{HCl}=0,3.2=0,6\left(mol\right)\)

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

0,2 <    0,6                        ( mol )

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

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

Chất dư là HCl

\(m_{HCl\left(dư\right)}=\left(0,6-0,4\right).36,5=7,3\left(g\right)\)

\(C_{M_{FeCl_2}}=\dfrac{0,2}{0,3}=0,66\left(M\right)\)

\(C_{M_{HCl\left(dư\right)}}=\dfrac{0,2}{0,3}=0,66\left(M\right)\)

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

\(n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\)

PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,3}{1}\), ta được H₂SO₄ dư.

Theo PT: \(n_{H_2SO_4\left(pư\right)}=n_{Fe}=0,2\left(mol\right)\Rightarrow n_{H_2SO_4\left(dư\right)}=0,3-0,2=0,1\left(mol\right)\)

\(\Rightarrow m_{Fe}=0,1.98=9,8\left(g\right)\)

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

c, \(n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\)

PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

Xét tỉ lệ: \(\dfrac{0,3}{1}>\dfrac{0,2}{1}\), ta được CuO dư.

Theo PT: \(n_{Cu}=n_{H_2}=0,2\left(mol\right)\Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)

\(a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ n_{HCl}=2\cdot0,15=0,3\left(mol\right)\)

Vì \(\dfrac{n_{Zn}}{1}>\dfrac{n_{HCl}}{2}\) nên sau p/ứ Zn dư

\(\Rightarrow n_{Zn}=\dfrac{1}{2}n_{HCl}=0,15\left(mol\right)\\ \Rightarrow m_{Zn}=0,15\cdot65=9,75\\ \Rightarrow m_{Zn\left(dư\right)}=13-9,75=3,25\left(g\right)\\ c,n_{H_2}=n_{Zn}=0,15\left(mol\right)\\ \Rightarrow V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\)

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

\(n_{H_2SO_4}=0,2.2=0,4\left(mol\right)\)

PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)

Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,4}{1}\), ta được H₂SO₄ dư.

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

b, - H₂SO₄ dư.

\(n_{H_2SO_4\left(pư\right)}=n_{Fe}=0,2\left(mol\right)\Rightarrow n_{H_2SO_4\left(dư\right)}=0,4-0,2=0,2\left(mol\right)\)

\(\Rightarrow m_{H_2SO_4\left(dư\right)}=0,2.98=19,6\left(g\right)\)

c, \(C_{M_{H_2SO_4\left(dư\right)}}=\dfrac{0,2}{0,2}=1\left(M\right)\)

Theo PT: \(n_{FeSO_4}=n_{Fe}=0,2\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,2}{0,2}=1\left(M\right)\)

Phương trình hóa học của phản ứng:

So sánh tỉ lệ  ⇒ Fe dư

Theo PT nFe (pư) = nH2SO4 = 0,25 mol ⇒ nFe dư = 0,4 – 0,25 = 0,15 mol

mFe dư = 0,15. 56 = 8,4g.

Do khối lượng Fe dư nên tính thể tích khí H2 theo số mol H2SO4.

nH2 = nH2SO4 = 0,25 mol

Vkhí = 0,25 . 22,4 = 5,6l.

\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)

\(n_{H_2SO_4}=0.2\cdot2=0.4\left(mol\right)\)

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

\(1.........1\)

\(0.2..........0.4\)

\(LTL:\dfrac{0.2}{1}< \dfrac{0.4}{1}\Rightarrow H_2SO_4dư\)

\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)

\(m_{H_2SO_4\left(dư\right)}=\left(0.4-0.2\right)\cdot98=19.6\left(g\right)\)

\(C_{M_{FeSO_4}}=\dfrac{0.2}{0.2}=1\left(M\right)\)

a) nFe=0,4(mol); nH2SO4=0,5(mol)

PTHH: Fe + H2SO4 -> FeSO4 + H2

Ta có: 0,4/1 < 0,5/1

=> Fe hết, H2SO4 dư. tính theo nFe.

=> nH2= nH2SO4(p.ứ)=nFe=0,4(mol)

=>nH2SO4(dư)=0,5-0,4=0,1(mol)

=>H2SO4(dư)=0,1.98=9,8(g)

b) V(H2,dktc)=0,4.22,4=8,96(l)