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a. \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
PTHH : 3Fe + 2O2 -to> Fe3O4
0,3 0,2 0,1
b. \(m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)
c. \(V_{O_2}=0,2.22,4=4,48\left(l\right)\)
a \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
b \(\Rightarrow n_{Fe}=\dfrac{16,8}{56}=0,3mol\) \(\Rightarrow n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=0,1mol\Rightarrow m_{Fe_3O_4}=0,1\cdot232=2,32g\)
c \(\Rightarrow n_{O_2}=\dfrac{2}{3}n_{Fe}=0,2mol\Rightarrow V_{O_2}=0,2\cdot22,4=4,48l\)
a) \(n_{Fe}=\dfrac{3,36}{56}=0,06\left(mol\right)\)
PTHH: 3Fe + 2O2 --to--> Fe3O4
0,06->0,04------->0,02
=> mFe3O4 = 0,02.232 = 4,64 (g)
b) VO2 = 0,04.22,4 = 0,896 (l)
a. \(n_{Fe_3O_4}=\dfrac{6,96}{232}=0,03\left(mol\right)\)
PTHH : 3Fe + 2O2 -to-> Fe3O4
0,09 0,06 0,03
\(m_{Fe}=0,09.56=5,04\left(g\right)\)
\(V_{O_2}=0,06.22,4=1,344\left(l\right)\)
b. PTHH : 2KCl + 3O2 -> 2KClO3
0,06 0,04
\(m_{KClO_3}=0,04.122,5=4,9\left(g\right)\)
\(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\\ pthh:3Fe+2O_2\underrightarrow{t^o}Fe_3O_{\text{4}}\)
0,15 0,1 0,05
\(m_{Fe_2O_4}=0,05.232=11,6\left(g\right)\\
V_{O_2}=0,1.11,4=2,24\left(l\right)\\
pthh:2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\uparrow\)
0,2 0,1
\(m_{KMnO_4}=0,2.158=31,6\left(g\right)\)
\(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\\ pthh:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
0,15 0,1 0,05
\(m_{Fe_3O_{\text{ 4}}}=0,05.232=11,6\left(g\right)\\ V_{O_2}=0,1.22,4=2,24\left(l\right)\\ pthh:2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
0,1 0,05
\(m_{KMnO_4}=0,1.158=15,8\left(g\right)\)
a) 3Fe + 2O2 
Fe3O4
b) nFe = \(\dfrac{8,4}{56}\)= 0,15 mol
nFe3O4 = \(\dfrac{11,6}{232}\) = 0,05 mol
Ta thấy \(\dfrac{nFe}{3}\)= \(\dfrac{nFe_3O_4}{1}\)=> Fe phản ứng hết
<=> nO2 cần dùng = \(\dfrac{2nFe}{3}\)= 0,1 mol
<=> mO2 cần dùng = 0,1.32 = 3,2 gam
c) Oxi chiếm thể tích bằng 1/5 thể tích không khí.
Mà V O2 = 0,1.22,4 = 2,24 lít => V không khí = 2,24 . 5 = 11,2 lít
\(a/3Fe+2O_2\xrightarrow[]{t^0}Fe_3O_4\\ b/n_{Fe}=\dfrac{1,4}{56}=0,025mol\\ n_{O_2}=\dfrac{0,025.2}{3}=\dfrac{0,05}{3}mol\\ V_{O_2}=\dfrac{0,05}{3}\cdot22,4\approx0,37l\\ c/C_1\\ n_{Fe_3O_4}=\dfrac{0,025}{3}mol\\ m_{Fe_3O_4}=\dfrac{0,025}{3}\cdot232\approx1,93g\\ C_2\\ m_{O_2}=\dfrac{0,05}{3}\cdot32\approx0,53g\\ BTKL:m_{Fe}+m_{O_2}=m_{Fe_3O_4}\\ \Rightarrow m_{Fe_3O_4}=1,4+0,53=1,93g\)
PT: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
Ta có: \(n_{Fe_3O_4}=\dfrac{23,2}{232}=0,1\left(mol\right)\)
a, Theo PT: \(n_{Fe}=3n_{Fe_3O_4}=0,3\left(mol\right)\)
\(\Rightarrow m=m_{Fe}=0,3.56=16,8\left(g\right)\)
b, Theo PT: \(n_{O_2}=2n_{Fe_3O_4}=0,2\left(mol\right)\)
\(\Rightarrow V_{O_2}=0,2.22,4=4,48\left(l\right)\)
\(3Fe+2O_2\rightarrow Fe_3O_4\)
\(3mol\) \(2mol\) \(1mol\)
\(0,3mol\) \(0,2mol\) \(0,1mol\)
\(n_{Fe_3O_4}=\dfrac{23,2}{232}=0,1\left(mol\right)\)
\(m_{Fe}=n.M=0,3.56=16,8\left(g\right)\)
\(V_{O_2}=n.22,4=0,2.22,4=4,48\left(l\right)\)
\(n_{Fe}=\dfrac{6,8}{56}=0,12mol\)
3Fe + 2O2 \(\underrightarrow{t^o}\) Fe3O4
0,12 0,08 0,04 ( mol )
a, \(V_{O_2}=0,08.22,4=1,792l\)
b, mFe3O4 = 0,04.232 = 9,28g
\(n_{Fe}=\dfrac{6,8}{56}=\dfrac{17}{140}(mol)\\ PTHH:3Fe+2O_2\xrightarrow{t^o}Fe_3O_4\\ a,n_{O_2}=\dfrac{2}{3}n_{Fe}=\dfrac{17}{210}(mol)\\ \Rightarrow V_{O_2}=\dfrac{17}{210}.22,4=1,81(g)\\ b,n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=\dfrac{17}{420}(mol)\\ \Rightarrow m_{Fe_3O_4}=\dfrac{17}{420}.232=9,39(g)\)
gọi số mol Fe là x
pthh : 3Fe + 2O2 --t---> Fe3O4
x---->\(\dfrac{2}{3}\)x----------> \(\dfrac{x}{3}\)
=> mFe3O4= \(\dfrac{x}{3}\) . 232 = \(\dfrac{232x}{3}\) (G)
=> VO2 = \(\dfrac{2x}{3}\) . 22,4 = \(\dfrac{224x}{15}\) (L)
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