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\(3Fe+2O2-->Fe3O4\)
\(n_{Fe3O4}=\frac{2,32}{232}=0,01\left(mol\right)\)
\(n_{Fe}=3n_{Fe3O4}=0,03\left(mol\right)\)
\(m_{Fe}=0,03.56=1,68\left(g\right)\)
\(n_{O2}=2n_{Fe3O4}=0,02\left(mol\right)\)
\(V_{O2}=0,02.22,4=0,448\left(l\right)\)
a, \(n_{Fe_3O_4}=\dfrac{6,96}{232}=0,03\left(mol\right)\)
PTHH: 3Fe + 2O2 ----to----> Fe3O4
Mol: 0,09 0,06 0,03
\(m_{Fe}=0,09.56=5,04\left(g\right)\)
\(m_{O_2}=0,06.32=1,92\left(g\right)\)
b,
PTHH: 2KClO3 ----to---> 2KCl + 3O2
Mol: 0,02 0,06
\(m_{KClO_3}=0,02.122,5=2,45\left(g\right)\)
a) 3Fe+2O2-->Fe3O4
n\(_{Fe3O4}=\frac{2,32}{232}=0,01\left(mol\right)\)
Theo pthh
n\(_{Fe}=3n_{Fe3O4}=0,03\left(mol\right)\)
m\(_{Fe}=0,03.56=1,68\left(g\right)\)
Theo pthh
n\(_{O2}=n_{Fe3O4}=0,02\left(mol\right)\)
m\(_{O2}=0,02.32=0,64\left(g\right)\)
b) 2KMnO4--->K2MnO4+MnO2+O2
Theo pthh
n\(_{KMnO4}=2n_{O2}=0,04\left(mol\right)\)
m\(_{KMnO4}=0,04.158=6,32\left(g\right)\)
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: \(n_{O_2}=2n_{Fe_2O_3}=0,02\left(mol\right)\Rightarrow V_{O_2}=0,02.22,4=0,448\left(l\right)\)
\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
\(2mol\) \(1mol\)
\(0,02mol\) \(0,01mol\)
\(n_{Fe_3O_4}=\dfrac{m}{M}=\dfrac{2,32}{232}=0,01\left(mol\right)\)
\(V_{O_2}=n.22,4=0,02.22,4=0,048\left(l\right)\)
a, Ta có: \(n_{Fe_3O_4}=\dfrac{4,64}{232}=0,02\left(mol\right)\)
PT: \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
THeo PT: \(n_{O_2}=2n_{Fe_3O_4}=0,04\left(mol\right)\Rightarrow V_{O_2}=0,04.22,4=0,896\left(l\right)\)
b, PT: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
\(n_{KMnO_4}=2n_{O_2}=0,08\left(mol\right)\Rightarrow m_{KMnO_4}=0,08.158=12,64\left(g\right)\)
a) \(n_{Fe_3O_4}=\dfrac{m_{Fe_3O_4}}{M_{Fe_3O_4}}=\dfrac{4,64}{232}=0,02\left(mol\right)\).
PTHH : \(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
Mol : 3 : 2 : 1
Mol 0,04 ← 0,02
\(\Rightarrow V_{O_2}=n_{O_2}.22,4=\left(0,04\right).\left(22,4\right)=0,896\left(l\right)\).
b) Từ phương trình ở câu a \(\Rightarrow n_{O_2}=0,04\left(mol\right)\).
PTHH : \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
Mol : 2 : 1 : 1 : 1
Mol : 0,08 ← 0,04
\(\Rightarrow m_{KMnO_4}=n_{KMnO_4}.M_{KMnO_4}=\left(0,08\right).158=12,64\left(g\right)\).
a. Số mol oxit sắt từ : nFe3O4=2,32(56.3+16.4)nFe3O4=2,32(56.3+16.4) = 0,01 (mol).
Phương trình hóa học.
3Fe + 2O2 -> Fe3O4
3mol 2mol 1mol.
0,01 mol.
Khối lượng sắt cần dùng là : m = 56.3.0,011=1,6856.3.0,011=1,68 (g).
Khối lượng oxi cần dùng là : m = 32.2.0,011=0,6432.2.0,011=0,64 (g).
a)\(n_{Fe_3O_4}=\dfrac{2,32}{232}=0,01\left(mol\right)\)
\(PTHH:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)
Theo PTHH, ta có:\(n_{Fe}=3n_{Fe_3O_4}=3.0,01=0,03\left(mol\right)\Rightarrow m_{Fe}=0,03.56=1,68\left(g\right)\)
Theo PTHH ta có:\(n_{O_2}=2n_{Fe_3O_4}=2.0,01=0,02\left(mol\right)\Rightarrow m_{O_2}=0,02.32=0,64\left(g\right)\)
b)PTHH:\(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
__________2____________________________1
________0,04___________________________0,02
\(m_{KMnO_4}=0,04.158=6,32\left(g\right)\)
a)\(n_{FE3O4}=\frac{17,4}{232}=0,075\left(mol\right)\)
\(3Fe+2O2---->Fe3O4\)
0,225<--0,15<------------------0,075
\(m_{Fe}=0,225.56=12,6\left(g\right)\)
\(V_{O2}=0,15.22,4=3,36\left(l\right)\)
b)\(2KCLO3-->2KCl+3O2\)
\(n_{KCLO3}=\frac{2}{3}n_{O2}=0,1\left(mol\right)\)
\(m_{KClO3}=0,1.122,5=12,25\left(g\right)\)
a, Ta có :
\(n_{Fe3O4}=\frac{17,4}{232}=0,075\left(mol\right)\)
\(PTHH:3Fe+2O_2\rightarrow Fe_3O_4\)
_______0,225__0,15______0,075__(mol)
\(\Rightarrow m_{Fe}=0,225.56=12,6\left(g\right)\)
\(\Rightarrow V_{O2}=0,15.22,4=3,36\left(l\right)\)
b,
\(PTHH:2KClO_2\rightarrow2KCl+3O_2\)
Ta có :
\(n_{KClO3}=\frac{2}{3}n_{O2}=0,1\left(mol\right)\)
\(\Rightarrow m_{KClO3}=0,1.122,5=12,25\left(g\right)\)
a.\(\%Fe=\dfrac{56.3}{56.3+16.4}.100=72,41\%\)
b.\(n_{Fe_3O_4}=\dfrac{4,64}{232}=0,02mol\)
\(3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\)
0,04 0,02 ( mol )
\(m_{O_2}=0,04.32=1,28g\)
c.\(2KMnO_4\rightarrow\left(t^o\right)K_2MnO_4+MnO_2+O_2\)
0,08 0,04 ( mol )
\(m_{KMnO_4}=0,08.158=12,64g\)
PTHH: 3Fe + 2O2 -to-> Fe3O4 (1)
a) Ta có: \(n_{Fe_3O_4}=\dfrac{3,48}{232}=0,015\left(mol\right)\)
Theo PTHH (1) và đề bài, ta có: \(n_{Fe}=3.0,015=0,045\left(mol\right)\\ n_{O_2}=2.0,015=0,03\left(mol\right)\)
=> \(m_{Fe}=0,045.56=2,52\left(g\right)\\ V_{O_2\left(đktc\right)}=0,03.22,4=0,672\left(l\right)\)
b) PTHH: 2KClO3 -to-> 2KCl + 3O2
Ta có: \(n_{O_2\left(2\right)}=n_{O_2\left(1\right)}=0,03\left(mol\right)\\ =>n_{KClO_3\left(2\right)}=\dfrac{2.0,03}{3}=0,02\left(mol\right)\\ =>m_{KClO_3\left(2\right)}=0,02.122,5=2,45\left(g\right)\)
nFe3O4=m/M=3,84/232=0,015(mol)
PT:
3Fe + 2O2 -t0-> Fe3O4
3............2...............1 (mol)
0,045<-0,03<- 0,015 (mol)
VO2=n.22,4=0,03.22,4=0,672(lít)
mFe=n.M=0,045.56=2,52(gam)
b)PT:
2KClO3 -t0-> 2KCl +3O2
2......................2............3 (mol)
0,02 <- 0,02 <- 0,03 (mol)
=>mKClO3=n.M=0,02.122,5=2,45(g)
3Fe+2O2-to>Fe3O4
0,06----------------0,03
n Fe3O4 =\(\dfrac{6,96}{232}\)=0,03 mol
=>VO2=0,06.22,4=1,344l
\(n_{Fe_3O_4}=\dfrac{6.96}{232}=0,03\left(mol\right)\)
PTHH : 3Fe + 2O2 -> Fe3O4
0,06 0,03
\(V_{O_2}=0,06.22,4=1,344\left(l\right)\)