\(m_{CuO}=40.20\%=8\left(g\right)\)

\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)

\(n_{Fe_2O_3}=\dfrac{40-8}{160}=0,2\left(mol\right)\)

PTHH:

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

 0,1      0,1

\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

0,2          0,6 

\(V_{H_2}=\left(0,1+0,6\right).22,4=15,68\left(l\right)\)

\(\left\{{}\begin{matrix}m_{CuO}=50.20\%=10\left(g\right)\\m_{Fe_2O_3}=50-10=40\left(g\right)\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\\n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\end{matrix}\right.\)

PTHH:
\(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)

0,125->0,125

\(Fe_2O_3+3H_2\xrightarrow[]{t^o}2Fe+3H_2\)

0,25--->0,75

\(\Rightarrow V_{H_2}=\left(0,75+0,125\right).22,4=18,2\left(l\right)\)

\(m_{CuO}=\dfrac{50.20}{100}=10\left(g\right)\)

\(m_{Fe_2O_3}=50-10=40\left(g\right)\)

\(n_{CuO}=\dfrac{m}{M}=\dfrac{10}{80}=0,125\left(mol\right)\)

\(n_{Fe_2O_3}=\dfrac{m}{M}=\dfrac{40}{160}=0,25\left(mol\right)\)

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

\(1mol\)     \(1mol\)

\(0,125mol\) \(0,125mol\)

\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

\(1mol\)       \(3mol\)

\(0,25mol\)   \(0,75mol\)

\(V_{H_2}=n.22,4=\left(0,125+0,75\right).22,4=19,6\left(l\right)\)

\(n_{Fe}=\dfrac{2,8}{56}=0,05mol\)

\(\Rightarrow m_{Cu}=6-2,8=3,2g\)\(\Rightarrow n_{Cu}=0,05mol\)

\(CuO+H_2\rightarrow Cu+H_2O\) 

            0,05     0,05

\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)

               0,075    0,05

\(\Rightarrow\Sigma n_{H_2}=0,075+0,05=0,125mol\)

\(\Rightarrow V=0,125\cdot22,4=2,8l\)

CHÚC BẠN HỌC TỐT

a) Theo đề bài, ta có: \(n_{O2}=\dfrac{20}{32}=0,625\left(mol\right)\)

PTHH: \(2H_2+O_2\underrightarrow{o}2H_2O\)

pư............1.........0,5......1 (mol)

Ta có tỉ lệ: \(\dfrac{1}{2}< 0,625\). Vậy O2 dư, H2 hết.

\(\Rightarrow m_{H2O}=18.1=18\left(g\right)\)

Vậy.........

b) Đề nhầm bạn ơi, Cu chỉ có hóa trị là: I hoặc II

ta có :

%mCuO=20% => mCuO= 10 g => nCuO=0,125(mol)

=> mFe2O3=40 (g)=>nFe2O3=0,25 ( mol)

Ta có PTHH :

\(\left(1\right)CuO+H2\rightarrow Cu+H2O\)

0,125mol..0,125mol

\(\left(2\right)Fe2O3+3H2\rightarrow2Fe+3H2O\)

0,25mol.........0,75mol

=> VH2(đktc)=(0,125+0,75).22,4=19,6(l)

Vậy thể tích khí H2 cần dùng là 19,6 (l)

1

`CuO+ H_2 -> Cu+ H_2O`

`0,03 ----0,03` mol

`Fe_2O_3+ 3H_2 ->2Fe + 3H_2O`

`0,1-------0,3` mol

`n_(CuO) = 2,4/80 =0,03` mol

`n_(Fe_2O_3)=16/160 =0,1` mol

`=> V_(H_2)=(0,3+0,03).22,4=7,392 l`

PT: Fe2O3+3H2to→2Fe+3H2O

CuO+H2to→Cu+H2O

a, Ta có:  mFe2O3=20.60%=12(g)

⇒nFe2O3=\(\dfrac{12}{160}\)=0,075(mol

mCuO=20−12=8(g

⇒nCuO=\(\dfrac{8}{80}\)=0,1(mol)

Theo pT: 

nFe=2nFe2O3=0,15(mol)

nCu=nCuO=0,1(mol)

⇒mFe=0,15.56=8,4(g)

mCu=0,1.64=6,4(g)

b, Theo PT: nH2=3nFe2O3+nCuO=0,325(mol)

⇒VH2=0,325.22,4=7,28(l)

c. Zn+2HCl->ZnCl2+H2

               0,65----------0,325

=>m HCl=0,65.36,5=23,725g

Ủa bạn cái câu a . 20x60% ( 20 ở đâu vậy bạn