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\(m_{CuO}=50.20\%=10\left(g\right)\)
\(n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)
\(m_{Fe_2O_3}=50-10=40\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\)
PTHH :
\(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
0,125 0,125 0,125
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
0,25 0,75 0,5
\(a,V_{H_2}=\left(0,75+0,125\right).22,4=19,6\left(l\right)\)
\(b,m_{Cu}=0,125.64=8\left(g\right)\)
\(m_{Fe}=0,5.56=28\left(g\right)\)
\(n_{Fe}=\dfrac{2,8}{56}=0,05mol\)
\(\Rightarrow m_{Cu}=6-2,8=3,2g\)\(\Rightarrow n_{Cu}=0,05mol\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,05 0,05
\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
0,075 0,05
\(\Rightarrow\Sigma n_{H_2}=0,075+0,05=0,125mol\)
\(\Rightarrow V=0,125\cdot22,4=2,8l\)
a, \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
b, \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{2}{3}n_{Fe}=0,2\left(mol\right)\Rightarrow V_{O_2}=0,2.22,4=4,48\left(l\right)\)
\(n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=0,1\left(mol\right)\Rightarrow m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)
c, \(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,3}{1}\), ta được H2 dư.
Theo PT: \(n_{Cu}=n_{CuO}=0,2\left(mol\right)\Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)
\(m_{CuO}=40.20\%=8\left(g\right)\)
\(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
\(n_{Fe_2O_3}=\dfrac{40-8}{160}=0,2\left(mol\right)\)
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
\(V_{H_2}=\left(0,1+0,6\right).22,4=15,68\left(l\right)\)
a) nCu=0,2(mol)
PTHH: CuO + H2 -to-> Cu + H2O
b) nH2=nCuO=nCu=0,2(mol)
=>V(H2,đktc)=0,2.22,4=4,48(l)
c) mCuO=0,2.80=16(g)
Bài 1.
\(n_{CuO}=\dfrac{48}{80}=0,6mol\)
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,6 0,6 0,6 ( mol )
\(m_{Cu}=0,6.64=38,4g\)
\(V_{H_2}=0,6.22,4=13,44l\)
Bài 2.
\(n_{H_2}=\dfrac{5,6}{22,4}=0,25mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,25 0,5 0,25 ( mol )
\(m_{Fe}=0,25.56=14g\)
\(m_{HCl}=0,5.36,5=18,25g\)
a, \(FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
b, \(n_{FeO}=\dfrac{7,2}{72}=0,1\left(mol\right)\)
\(n_{Fe}=n_{FeO}=0,1\left(mol\right)\Rightarrow m_{Fe}=0,1.56=5,6\left(g\right)\)
c, \(n_{H_2}=n_{FeO}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
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
Ta có: \(\dfrac{m_{FeO}}{m_{CuO}}=\dfrac{3}{1}\)
\(\Rightarrow m_{FeO}=3m_{CuO}\)
Mà: \(m_{FeO}+m_{CuO}=48\)
\(\Leftrightarrow3m_{CuO}+m_{CuO}=48\)
\(\Rightarrow m_{CuO}=12\left(g\right)\) \(\Rightarrow n_{CuO}=\dfrac{12}{80}=0,15\) mol
\(\Rightarrow m_{FeO}=3m_{CuO}=3\times12=36\left(g\right)\)
\(\Rightarrow n_{FeO}=\dfrac{36}{72}=0,5\) mol
Pt: FeO + H2 --to--> Fe + H2O
0,5 mol-> 0,5 mol--> 0,5 mol
......CuO + H2 --to--> Cu + H2O
0,15 mol->0,15 mol-> 0,15 mol
mFe thu được = 0,5 . 56 = 28 (g)
mCu thu được = 0,15 . 64 = 9,6 (g)
VH2 pứ = (0,5 + 0,15) . 22,4 = 14,56 (lít)