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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
\(\Rightarrow\Sigma n_{H_2}=0,075+0,05=0,125mol\)
\(\Rightarrow V=0,125\cdot22,4=2,8l\)
PTHH: H2 + PbO --- Pb+H2O
PTHH: H2 + FeO---- Fe+H2O
a, nH2= 0,4 mol
=> mFeO= 28,8 g
=> mPbO = 93,2 g
b, PTHH: Zn+2HCl-----ZnCl2 +H2
có nH2 =0,4 mol (cmt)
=> mZn= 26 g
=> nHCl= 7,3 g
a, Ta có nH2=0,8/2 = 0,4 mol
Gọi nPb là x, nFe là y ta có:
PbO + H2 -----> Pb + H2O
x mol <----- x mol
FeO + H2 -----> Fe + H2O
y mol <---- y mol
Ta có: { x + y = 0,4 mol
{ 207x + 56y = 31,9 g
=> { x ≈ 0,063 mol
{ y ≈ 0,337 mol
Nên mPbO =223.0,063≈ 14,05 g
mFeO =72.0,337≈ 24,26 g
b, từ câu a, ta có nH2=0,4 mol
PTPƯ: Zn + 2HCl ---> ZnCl2 + H2
0,4 mol <-------------------- 0,4 mol
0,8 mol <--------- 0,4 mol
Vậy: mZn = 65.0,4 = 26 g
mHCl = 36,5.0,8=29,2 g
a)PTHH: CuO + H2\(\rightarrow\) Cu + H2O (1)
Fe2O3 + 3H2 \(\rightarrow\)2Fe + 3H2O(2)
b) nH2= \(\dfrac{5,6}{22,4}\)=0,25mol
Gọi nH2(PT1)=a
nH2(PT2)=b
=>a+b=0,25mol
<=> a=0,25-b
Theo PT1: nCuO=nH2(PT1)=a
Theo PT2: nFe2O3=1/3nH2(PT2)=1/3b
Có mCuO+mFe2O3=16g
80a+160.1/3b=16
80(0,25-b)+160/3b=16
20-80b+160/3b=16
b=0,03mol
nFe2O3=1/3.0,15=0,03mol
mFe2O3=0,03.160=8g
%mFe2O3=\(\dfrac{8}{16}\).100%=50%
%mCuO=100%-50%=50%
c)nCuO=0,25-0,15=0,1mol
Theo PT1: nCu=nCuO=0,1mol
=>mCu=0,1.64=6,4g
Theo PT2: nFe=2nFe2O3=0,06mol
mFe=0,06.56=3,36g
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
\(n_{Cu}=\dfrac{6,4}{64}=0,1mol\)
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,1 0,1 ( mol )
\(\left\{{}\begin{matrix}m_{CuO}=0,1.80=8g\\m_{FeO}=12-8=4g\end{matrix}\right.\)
a)
FeO + H2 --to--> Fe + H2O
CuO + H2 --to--> Cu + H2O
b) \(n_{Cu}=\dfrac{6,4}{64}=0,1\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
0,1<--0,1<-----0,1
=> \(m_{FeO}=12-0,1.80=4\left(g\right)\)
=> \(n_{FeO}=\dfrac{4}{72}=\dfrac{1}{18}\left(mol\right)\)
FeO + H2 --to--> Fe + H2O
\(\dfrac{1}{18}\)-->\(\dfrac{1}{18}\)----->\(\dfrac{1}{18}\)
=> \(V_{H_2}=\left(0,1+\dfrac{1}{18}\right).22,4=\dfrac{784}{225}\left(l\right)\)
c) \(m_{Fe}=\dfrac{1}{18}.56=\dfrac{28}{9}\left(g\right)\)
d) \(\left\{{}\begin{matrix}m_{CuO}=0,1.80=8\left(g\right)\\m_{FeO}=4\left(g\right)\end{matrix}\right.\)
Gọi số mol Fe3O4, PbO là a, b
=> 232a + 223b= 78,95
PTHH: Fe3O4 + 4H2 --to--> 3Fe + 4H2O
a------>4a---------->3a
PbO + H2 --to--> Pb + H2O
b--->b--------->b
=> 56.3a + 207.b = 68,55
=> a = 0,1; b = 0,25
=> \(\left\{{}\begin{matrix}\%Fe_3O_4=\dfrac{232.0,1}{78,95}.100\%=29,386\%\\\%PbO=\dfrac{0,25.223}{78,95}.100\%=70,614\%\end{matrix}\right.\)
nH2 = 4a + b = 0,65 (mol)
=> VH2 = 0,65.22,4 = 14,56 (l)
\(n_{Cu}=\dfrac{19,2}{64}=0,3mol\)
\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,3 0,3 ( mol )
\(m_{CuO}=0,3.80=24g\)
\(\Rightarrow m_{Fe_2O_3}=40-24=16g\)
\(\%m_{CuO}=\dfrac{24}{40}.100=60\%\)
\(\%m_{Fe_2O_3}=100\%-60\%=40\%\)
\(n_{Cu}=\dfrac{19,2}{64}=0,3mol\)
\(CuO+H_2\rightarrow Cu+H_2O\)
0,3 0,3
\(\Rightarrow n_{CuO}=0,3\Rightarrow m_{CuO}=24g\)
\(\Rightarrow m_{Fe_2O_3}=40-24=16g\Rightarrow n_{Fe_2O_3}=0,1mol\)
\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
\(\%m_{CuO}=\dfrac{24}{40}\cdot100\%=60\%\)
\(\%m_{Fe_2O_3}=100\%-60\%=40\%\)