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![](https://rs.olm.vn/images/avt/0.png?1311)
4FeS2 + 11O2 --to--> 2Fe2O3 + 8SO2
=> Tổng hệ số chất sản phẩm là: 2+8 = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{C_2H_2}=\dfrac{2,6}{26}=0,1\left(mol\right)\\ 2C_2H_2+5O_2\rightarrow\left(t^o\right)4CO_2+2H_2O\\ a,n_{O_2}=\dfrac{5}{2}.n_{C_2H_2}=\dfrac{5}{2}.0,1=0,25\left(mol\right)\\ \Rightarrow V_{O_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\\ b,n_{CO_2}=\dfrac{4}{2}.n_{C_2H_2}=\dfrac{4}{2}.0,1=0,2\left(mol\right)\\ \Rightarrow m_{CO_2}=0.2.44=8,8\left(g\right)\\ n_{H_2O}=n_{C_2H_2}=0,1\left(mol\right)\\ \Rightarrow m_{H_2O}=0,1.18=1,8\left(g\right)\\ \Rightarrow m_{sp}=m_{CO_2}+m_{H_2O}=8,8+1,8=10,6\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Do quặng chứa 10% tạp chất
=> FeS2 chiếm 90%
\(m_{FeS_2}=\dfrac{125.90}{100}=112,5\left(g\right)\)
=> \(n_{FeS_2}=\dfrac{112,5}{120}=0,9375\left(mol\right)\)
PTHH: 4FeS2 + 11O2 --to--> 2Fe2O3 + 8SO2
0,9375---------------------->1,875
=> VSO2 = 1,875.22,4 = 42 (l)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(m_{FeS_2}=400.\left(100-10\right)\%=360\left(g\right)\\ \rightarrow n_{FeS_2}=\dfrac{360}{120}=3\left(mol\right)\)
PTHH: 4FeS2 + 11O2 --to--> 2Fe2O3 + 8SO2
3 3
\(\rightarrow V_{SO_2}=6.22,4=134,4\left(l\right)\)
Fe2O3 oxit bazo, SO2 oxit axit
![](https://rs.olm.vn/images/avt/0.png?1311)
nFeS2 = 120/120 = 1 (mol)
PTHH: 4FeS2 + 11O2 -> (t°) 2Fe2O3 + 8SO2
Mol: 1 ---> 2,75 ---> 0,5 ---> 2
VO2 = 2,75/(100% - 10%) . 22,4 = 616/9 (l)
msp = (0,5 . 160 + 8 . 64) . 80% = 437,6 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
nFeS2 = 120/120 = 1 (mol)
PTHH: 4FeS2 + 11O2 -> (t°) 2Fe2O3 + 8SO2
Mol: 1 ---> 2,75 ---> 0,5 ---> 2
VO2 = 2,75/(100% - 10%) . 22,4 = 616/9 (l)
msp = (0,5 . 160 + 8 . 64) . 80% = 437,6 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
$a\big)$
$n_{Fe}=\frac{16,8}{56}=0,3(mol)$
$3Fe+2O_2\xrightarrow{t^o}Fe_3O_4$
Theo PT: $n_{Fe_3O_4}=\frac{1}{3}n_{Fe}=0,1(mol)$
$\to m_{Fe_3O_4}=0,1.232=23,2(g)$
$b\big)$
Theo PT: $n_{O_2}=\frac{2}{3}n_{Fe}=0,2(mol)$
$\to V_{O_2}=0,2.22,4=4,48(l)$
$\to V_{kk}=4,48.5=22,4(l)$
$c\big)$
$2KMnO_4\xrightarrow{t^o}K_2MnO_4+MnO_2+O_2$
Theo PT: $n_{KMnO_4}=2n_{O_2}=0,4(mol)$
$\to m_{KMnO_4(dùng)}=\frac{0,4.158}{80\%}=79(g)$
a, \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
PTHH: 3Fe + 2O2 ---to→ Fe3O4
Mol: 0,3 0,2 0,1
\(m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)
b, \(V_{O_2}=0,2.22,4=4,48\left(l\right)\Rightarrow V_{kk}=4,48.5=22,4\left(l\right)\)
c,
PTHH: 2KMnO4 ---to→ K2MnO4 + MnO2 + O2
Mol: 0,4 0,2
\(m_{KMnO_4\left(lt\right)}=0,4.158=63,2\left(g\right)\)
\(\Rightarrow m_{KMnO_4\left(tt\right)}=\dfrac{63,2}{80\%}=79\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
4FeS2+11O2-to>2Fe2O3+8SO2
1-------------2,75-------0,5-------2 mol
n FeS2=\(\dfrac{120}{120}=1mol\)
=>VO2=2,75.\(\dfrac{110}{100}\).32=96,8g
H=80%
=>m Fe2O3=0,5.160.\(\dfrac{80}{100}\)=64g
\(a,n_{FeS_2}=\dfrac{m_{FeS_2}}{M_{FeS_2}}=\dfrac{6}{120}=0,05\left(mol\right)\\ 4FeS_2+11O_2\rightarrow\left(t^o,xt\right)2Fe_2O_3+8SO_2\uparrow\\ n_{Fe_2O_3}=\dfrac{2}{4}.n_{FeS_2}=\dfrac{2}{4}.0,05=0,025\left(mol\right)\\ \Rightarrow m_{Fe_2O_3}=160.0,025=4\left(g\right)\\ n_{SO_2}=\dfrac{8}{4}.n_{FeS_2}=\dfrac{8}{4}.0,05=0,1\left(mol\right)\\ \Rightarrow m_{SO_2}=0,1.64=6,4\left(g\right)\\ \Rightarrow m_{sp}=m_{Fe_2O_3}+m_{SO_2}=4+6,4=10,4\left(g\right)\\ b,n_{O_2}=\dfrac{11}{4}.n_{FeS_2}=\dfrac{11}{4}.0,05=0,1375\left(mol\right)\\ \Rightarrow V_{O_2\left(đktc\right)}=0,1375.22,4=3,08\left(l\right)\\ \Rightarrow V_{kk\left(đktc\right)}=3,08.5=15,4\left(l\right)\)
\(pthh:4FeS_2+11O_2\overset{t^o}{--->}2Fe_2O_3+8SO_2\uparrow\)
a. Ta có: \(n_{FeS_2}=\dfrac{6}{120}=0,05\left(mol\right)\)
Theo pt: \(n_{O_2}=\dfrac{11}{4}.n_{FeS_2}=\dfrac{11}{4}.0,05=0,1375\left(mol\right)\)
\(\Rightarrow m_{sản.phẩm.thu.được}=6+0,1375.32=10,4\left(g\right)\)
b. Ta có: \(V_{O_2}=0,1375.22,4=3,08\left(lít\right)\)
Mà: \(V_{O_2}=\dfrac{1}{5}V_{kk}\)
\(\Rightarrow V_{kk}=3,08.5=15,4\left(lít\right)\)