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nFe3O4 = 23.2/232 = 0.1 mol
3Fe + 2O2 -to-> Fe3O4
0.3____0.2_______0.1
mFe = 0.3*56 = 16.8 g
VO2 = 0.2*22.4 = 4.48 (l)
Vkk = 5VO2 = 22.4 (l)
nFe= 0,03(mol)
a) PTHH: 3 Fe +2 O2 -to-> Fe3O4
nFe3O4= nFe/3= 0,03/3=0,01(mol)
=> mFe3O4=232.0,01=2,32(g)
b) nO2= 2/3 . nFe3O4= 2/3 . 0,03=0,02(mol)
=>V(O2,đktc)=0,02.22,4=0,448(l)
d) V(kk,đktc)=5.V(O2,đktc)= 5.0,448=2,24(l)
nFe = 33,6 : 56 = 0,6 (mol)
pthh : 3Fe + 2O2 -t--> Fe3O4
0,6--> 0,4------->0,2 (mol)
=> vO2 = 0,4.22,4 = 8,96 (mol)
=> mFe3O4 = 0,2.232 = 46,4 (g)
pthh : 2KClO3 -t--> 2KClO3 + 3O2
0,267<-----------------------0,4(mol)
mKClO3= 0,267 .122,5 = 32,67 (g)
a, \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
b, Ta có: \(n_{Fe}=\dfrac{50,4}{56}=0,9\left(mol\right)\)
Theo PT: \(n_{O_2}=\dfrac{2}{3}n_{Fe}=0,6\left(mol\right)\Rightarrow V_{O_2}=0,6.22,4=13,44\left(l\right)\)
c, \(n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=0,3\left(mol\right)\Rightarrow m_{Fe_3O_4}=0,3.232=69,6\left(g\right)\)
d, \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
Theo PT: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=0,4\left(mol\right)\Rightarrow m_{KClO_3}=0,4.122,5=49\left(g\right)\)
\(n_{Fe}=\dfrac{m}{M}=\dfrac{50,4}{56}=0,9\left(mol\right)\)
\(a.PTHH:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
3 2 1
0,9 0,6 0,3
\(b.V_{O_2}=n.24,79=0,6.24,79=14,874\left(l\right)\)
\(c.m_{Fe_3O_4}=n.M=0,3.\left(56.3+16.4\right)=69,6\left(g\right)\)
\(d.V_{O_2}=14,874\left(l\right)\\ \Rightarrow n_{O_2}=\dfrac{V}{24,79}=\dfrac{14,874}{24,79}=0,6\left(mol\right)\\ PTHH:2KClO_3\underrightarrow{t^o}2KCl+3O_2\)
2 2 3
0,6 0,6 0,9
\(m_{KClO_3}=n.M=0,6.\left(39+35,5+16.3\right)=55,5\left(g\right).\)
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 \(\Rightarrow n_{O_2}=\dfrac{2}{3}n_{Fe}=0,2mol\Rightarrow V_{O_2}=0,2\cdot22,4=4,48l\)
PTHH:3Fe+2O2----->Fe3O4
a.nFe3O4=mFe3O4MFe3O4=46,4232=0,2(mol)nFe3O4=mFe3O4MFe3O4=46,4232=0,2(mol)
Theo PTHH:nO2=2nFe3O4=2.0,2=0,4(mol)nO2=2nFe3O4=2.0,2=0,4(mol)
VO2=nO2.22,4=0,4.22,4=8,96(l)VO2=nO2.22,4=0,4.22,4=8,96(l)
b.Theo PTHH:nFe=3nFe3O4=3.0,2=0,6(mol)nFe=3nFe3O4=3.0,2=0,6(mol)
mFe=nFe.MFe=0,6.56=33,6(g)mFe=nFe.MFe=0,6.56=33,6(g)
c.PTHH:4Al+3O2----->2Al2O3
Theo PTHH:nAl=43nO2=43.0,4=815(mol)nAl=43nO2=43.0,4=815(mol)
mAl=nAl.MAl=815.27=14,4(g)
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
\(m_{KClO_3}=0,04.122,5=4,9\left(g\right)\)
nFe3O4= 0,1(mol)
PTHH: 3 Fe +2 O2 -to-> Fe3O4
nFe=3.nFe3O4=3.0,1=0,3(mol)
=> mFe=0,3.56=16,8(g)
nO2=2.nFe3O4=2.0,1=0,2(mol)
=>V(O2,đktc)=0,2.22,4=4,48(l)
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