\(n_{CuO} = \dfrac{8}{80} = 0,1(mol)\\ n_{CO} = \dfrac{3,36}{22,4} = 0,15(mol)\\ CuO + CO \xrightarrow{t^o} Cu + CO_2\\ n_{CuO} < n_{CO} \Rightarrow \text{Hiệu suất tính theo số mol của CuO}\\ CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O\\ n_{CuO\ pư} = n_{CO_2} = n_{CaCO_3} = \dfrac{7}{100} = 0,07(mol)\\ \Rightarrow H = \dfrac{0,07}{0,1}.100\% = 70\%\)

PTHH:

4H2+Fe3O4----->3Fe+4H2O

nH2=V/22,4=6,72/22,4=0,3mol

Theo PTHH:4molH2--->3molFe 0,3molH2->0,3.3/4=0,225molFe

mFe=nFe.M=0,225.56=12,6g

nO= nH2O= nH2= 0,3(mol)

m=m(oxit) - mO= 24- 0,3.16= 19,2(g)

nFe2O3= 0,1(mol)

Fe2O3 + 3 H2 -to-> 2 Fe +3 H2O

nFe=2.nFe2O3= 2. 0,1=0,2(mol)

nHCl=0,3(mol)

PTHH:  Fe +2 HCl -> FeCl2 + H2

Ta có: 0,3/2 < 0,2/1

=> Fe dư, HCl hết, tính theo nHCl

=> nH2=nHCl/2=0,3/2=0,15(mol)

=>V(H2,đktc)=0,15 . 22,4= 3,36(l)

2H2O -------->2H2+O2

x                          2x     x

suy ra x=0,2

CuO  +  H2  ----------.Cu   +H2O

0,2<---- 0,2

mCu=12,8g

mình vẫn chư hiểu rõ lắm

\(n_{Fe}=\dfrac{16.8}{56}=0.3\left(mol\right)\)

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

\(0.3....................0.3.........0.3\)

\(m_{FeCl_2}=0.3\cdot127=38.1\left(g\right)\)

\(V_{H_2}=0.6\cdot22.4=6.72\left(l\right)\)

\(CuO+H_2\underrightarrow{t^0}Cu+H_2O\)

\(.......0.3...0.3\)

\(m_{Cu}=0.3\cdot64=19.2\left(g\right)\)

PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)

a, Ta có: \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)

Theo PT: \(n_{FeCl_2}=n_{Fe}=0,3\left(mol\right)\)

\(\Rightarrow m_{FeCl_2}=0,3.127=38,1\left(g\right)\)

b, Theo PT: \(n_{H_2}=n_{Fe}=0,3\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)

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

Theo PT: \(n_{Cu}=n_{H_2}=0,3\left(mol\right)\)

\(\Rightarrow m_{Cu}=0,3.64=19,2\left(g\right)\)

Bạn tham khảo nhé!

 Phương trình : 

CuO + H₂ => Cu + H₂O

Khối lượng bình tăng lên 0,9g => \(m_{H_2O}=0,9\left(g\right)\)

=> \(n_{H_2O}=\dfrac{0,9}{18}=0,05\left(mol\right)\)

Theo pt: \(nH_2O=nCuO=\dfrac{8}{80}=0,1\left(mol\right)\)

Vậy hiệu suất phản ứng là : H = \(\dfrac{0,05}{0,1}=50\%\)

a) Fe + H₂SO₄ --> FeSO₄ + H₂

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

PTHH: Fe + H₂SO₄ --> FeSO₄ + H₂

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

=> V_H2 = 0,1.22,4 = 2,24 (l)

c) \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

PTHH: CuO + H₂ --t^o--> Cu + H₂O

Xét tỉ lệ: \(\dfrac{0,15}{1}>\dfrac{0,1}{1}\) => CuO dư, H₂ hết

PTHH: CuO + H₂ --t^o--> Cu + H₂O

              0,1<--0,1------->0,1

=> m_CuO(dư) = (0,15 - 0,1).80 = 4 (g)

m_Cu = 0,1.64 = 6,4 (g)

a, PT: \(Fe+H_2SO_4\rightarrow H_2SO_4+H_2\)

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

Theo PT: \(n_{H_2}=n_{Fe}=0,1\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)

c, Ta có: \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

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

Xét tỉ lệ: \(\dfrac{0,15}{1}>\dfrac{0,1}{1}\), ta được CuO dư.

Theo PT: \(n_{Cu}=n_{CuO\left(pư\right)}=n_{H_2}=0,1\left(mol\right)\)

\(\Rightarrow n_{CuO\left(dư\right)}=0,05\left(mol\right)\Rightarrow m_{CuO\left(dư\right)}=0,05.80=4\left(g\right)\)

\(m_{Cu}=0,1.64=6,4\left(g\right)\)

Bạn tham khảo nhé!

Bài 1.

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

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

0,1         0,1         0,1          0,1

\(V_{H_2}=0,1\cdot22,4=2,24l\)

\(n_{CuO}=\dfrac{12}{80}=0,15mol\)

\(CuO+H_2\rightarrow Cu+H_2O\)

0,15      0,1

\(\Rightarrow CuO\) dư và dư \(\left(0,15-0,1\right)\cdot80=4g\)

Bài 2.

\(n_P=\dfrac{3,1}{31}=0,1mol\)

\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)

0,1     0,125

\(V_{O_2}=0,125\cdot22,4=2,8l\)

\(n_{Zn}=\dfrac{19,5}{65}=0,3mol\)

\(2Zn+O_2\underrightarrow{t^o}2ZnO\)

0,3       0,125  0

0,25     0,125  0,25

0,05       0       0,25

\(\Rightarrow ZnO\) dư và dư \(0,05\cdot81=4,05g\)

Bài 1.

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

PTHH: Fe + H₂SO₄ ---> FeSO₄ + H₂

Mol:     0,1                                    0,1

b, \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)

c, \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

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

PTHH: CuO + H₂ ---t^o----> Cu + H₂O

Mol:      0,1     0,1

\(m_{CuOdư}=\left(0,15-0,1\right).80=4\left(g\right)\)

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

b+c) Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)=n_{CuO}=n_{Cu}\)

\(\Rightarrow\left\{{}\begin{matrix}m_{Cu}=0,1\cdot64=6,4\left(g\right)\\m_{CuO}=80\cdot0,1=8\left(g\right)\end{matrix}\right.\)

d) Ta có: \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

\(\Rightarrow\) CuO còn dư, Hidro p/ứ hết

\(\Rightarrow n_{CuO\left(dư\right)}=0,05\left(mol\right)\) \(\Rightarrow m_{CuO\left(dư\right)}=80\cdot0,05=4\left(g\right)\)