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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
\(m_{KClO_3}=0,04.122,5=4,9\left(g\right)\)
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)PTHH:2KClO\(_3\)➞\(^{t^o}\)2KCl+3O\(_2\)
b) n\(_{KClO_3}\)=\(\dfrac{m_{KClO_3}}{M_{KClO_3}}\)=\(\dfrac{12,15}{122,5}\)\(\approx\)0,1(m)
PTHH : 2KClO\(_3\) ➞\(^{t^o}\) 2KCl + 3O\(_2\)
tỉ lệ : 2 2 3
số mol : 0,1 0,1 0,15
V\(_{O_2}\)=n\(_{O_2}\).22,4=0,15.22,4=3,36(l)
c)PTHH : 2Zn + O\(_2\) -> 2ZnO
tỉ lệ : 2 1 2
số mol :0,3 0,15 0,3
m\(_{Zn}\)=n\(_{Zn}\).M\(_{Zn}\)=0,3.65=19,5(g)
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: \(4Fe+3O_2\rightarrow2Fe_2O_3\)
b: Hệ só là 4:3:2
c: \(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
=>\(n_{Fe_2O_3}=0.05\left(mol\right)\)
\(\Leftrightarrow m_{Fe_2O_3}=0.05\cdot160=8\left(g\right)\)
\(a,PTHH:3Fe+2O_2\xrightarrow{t^o}Fe_3O_4\\ n_{Fe}=\dfrac{5,6}{56}=0,1(mol)\\ b,\text{Tỉ lệ: }3:2:1\\ c,n_{Fe_3O_4}=\dfrac{1}{3}=\dfrac{1}{30}(mol)\\ \Rightarrow m_{Fe_3O_4}=\dfrac{1}{30}.232\approx 7,73(g)\)
\(d,n_{O_2}=\dfrac{2}{3}n_{Fe}=\dfrac{1}{15}(mol)\\ \Rightarrow V_{O_2}=\dfrac{1}{15}.22,4\approx 1,49(l)\\ e,PTHH:2KMnO_4\xrightarrow{t^o}K_2MnO_4+MnO_2+O_2\\ \Rightarrow n_{KMnO_4}=2n_{O_2}=\dfrac{2}{15}(mol)\\ \Rightarrow m_{KMnO_4}=\dfrac{2}{15}.158\approx 21,07(g)\)
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) \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
b) \(n_{Fe_3O_4}=\dfrac{2,32}{232}=0,01\left(mol\right)\)
Theo PTHH: \(n_{O_2}=0,02\left(mol\right)\Rightarrow V_{O_2}=0,02.22,4=0,448\left(l\right)\)
c)
PTHH: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
0,04<-----------------------0,02
=> \(m_{KMnO_4}=0,04.158=6,32\left(g\right)\)
nFe3O4 = 17.4/232 = 0.075 (mol)
3Fe + 2O2 -to-> Fe3O4
0.225__0.15_____0.075
mFe = 0.225*56=12.6 (g)
VO2 = 0.15*22.4 = 3.36 (l)
2KClO3 -to-> 2KCl + 3O2
0.1________________0.15
mKClO3 = 0.1*122.5 = 12.25 (g)
a) PTHH: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
b) Ta có: \(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
\(\Rightarrow n_{O_2}=0,1\left(mol\right)\) \(\Rightarrow V_{O_2}=0,1\cdot22,4=2,24\left(l\right)\)
c) PTHH: \(2KClO_3\xrightarrow[t^o]{MnO_2}2KCl+3O_2\uparrow\)
Theo PTHH: \(n_{KClO_3}=\dfrac{2}{3}n_{O_2}=\dfrac{1}{15}\left(mol\right)\)
\(\Rightarrow m_{KClO_3}=\dfrac{1}{15}\cdot122,5\approx8,17\left(g\right)\)
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