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a, \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
b, \(n_{Fe_2O_3}=\dfrac{2,32}{232}=0,01\left(mol\right)\)
Theo PT: \(n_{O_2}=2n_{Fe_2O_3}=0,02\left(mol\right)\Rightarrow V_{O_2}=0,02.22,4=0,448\left(l\right)\)
\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
\(2mol\) \(1mol\)
\(0,02mol\) \(0,01mol\)
\(n_{Fe_3O_4}=\dfrac{m}{M}=\dfrac{2,32}{232}=0,01\left(mol\right)\)
\(V_{O_2}=n.22,4=0,02.22,4=0,048\left(l\right)\)
nFe3O4 = 2,32/232 = 0,01 mol
3Fe + 2O2 ➝ Fe3O4
0,03 0,02 0,01 (mol)
a) mFe = 0,03.56 = 1,68 gam
b) VO2 = 0,02.22,4 = 0,448 lít
PTHH: \(3Fe+2O_2\xrightarrow[]{t^o}Fe_3O_4\)
Ta có: \(n_{Fe_3O_4}=\dfrac{2,32}{232}=0,01\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,02\left(mol\right)\\n_{Fe}=0,03\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Fe}=0,03\cdot56=1,68\left(g\right)\\V_{O_2}=0,02\cdot22,4=0,448\left(l\right)\end{matrix}\right.\)
a, \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
b, \(2Fe+O_2\rightarrow2FeO\)
c, \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
d, \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
e, \(2Cu+O_2\underrightarrow{t^o}2CuO\)
f, \(4K+O_2\underrightarrow{t^o}2K_2O\)
a) \(n_{Fe_3O_4}=\dfrac{2,32}{232}=0,01\left(mol\right)\)
PTHH: 3Fe + 2O2 --to--> Fe3O4
0,03<-0,02<------0,01
=> mFe = 0,03.56 = 1,68 (g)
b) VO2 = 0,02.22,4 = 0,448 (l)
3Fe+2O2-to>Fe3O4
0,06----------------0,03
n Fe3O4 =\(\dfrac{6,96}{232}\)=0,03 mol
=>VO2=0,06.22,4=1,344l
a) nFe3O4= 0,01mol
PTHH: 3Fe+2O2->Fe3O4
suy ra: nO2=0,02mol
b) PTHH:2KMnO4-> KMnO2+MnO2+O2
-> nKMnO4=0,02.2=0,04mol
->mKMnO4=0.04.158=6.32g
\(n_{Fe_3O_4}=\dfrac{m}{M}=\dfrac{4,64}{232}=0,02mol\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)
0,06 0,04 0,02 ( mol )
\(m_{Fe}=n_{Fe}.M_{Fe}=0,06.56=3,36g\)
\(V_{O_2}=n_{O_2}.22,4=0,04.22,4=0,896l\)
C
C. 3Fe + 2O2--> Fe3O4