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![](https://rs.olm.vn/images/avt/0.png?1311)
Gọi nC = a (mol); nS = b (mol)
12a + 32b = 12 (1)
PTHH:
C + O2 -> (t°) CO2
a ---> a ---> a
S + O2 -> (t°) SO2
b ---> b ---> b
44a + 64b = 28 (2)
Từ (1)(2) => a = 0,2 (mol); b = 0,3 (mol)
nO2 = 0,2 + 0,3 = 0,5 (mol)
VO2 = 0,5 . 22,4 = 11,2 (l)
![](https://rs.olm.vn/images/avt/0.png?1311)
BTKL: \(m_{S+C}+m_{O_2}=m_{SO_2+CO_2}\)
\(\Rightarrow m_{O_2}=15,2-5,6=9,6g\)
\(\Rightarrow n_{O_2}=0,3mol\)
\(\Rightarrow V_{O_2}=0,3\cdot22,4=6,72l\)
\(\Rightarrow V_{kk}=5\cdot6,72=33,6l\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Gọi số mol C, S là a, b
=> 12a + 32b = 7,68
PTHH: C + O2 --to--> CO2
_____a--------------->a
S + O2 --to--> SO2
b--------------->b
=> a + b = \(\dfrac{9,856}{22,4}=0,44\)
=> a = 0,32; b = 0,12
=> \(\left\{{}\begin{matrix}\%C=\dfrac{0,32.12}{7,68}.100\%=50\%\\\%S=\dfrac{0,12.32}{7,68}.100\%=50\%\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(n_{SO_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH: S + O2 --to--> SO2
0,5<-0,5<------0,5
=> mS = 0,5.32 = 16(g)
=> \(\left\{{}\begin{matrix}\%m_S=\dfrac{16}{22,2}.100\%=72,07\%\\\%m_P=\dfrac{22,2-16}{22,2}.100\%=27,93\%\end{matrix}\right.\)
b) \(n_P=\dfrac{22,2-16}{31}=0,2\left(mol\right)\)
PTHH: 4P + 5O2 --to--> 2P2O5
0,2-->0,25----->0,1
=> \(V_{O_2}=0,25.22,4=5,6\left(l\right)\)
c)
PTHH: 2KClO3 --to--> 2KCl + 3O2
0,5<-------------------0,75
=> \(m_{KClO_3}=0,5.122,5=61,25\left(g\right)\)
a) PTHH:
\(S+O_2\rightarrow\left(t^o\right)SO_2\\ 4P+5O_2\rightarrow\left(t^o\right)2P_2O_5\)
- Chất khí mùi hắc là SO2
- Chất rắn sau phản ứng có m(g) là P2O5
Đặt: nS=a(mol); nP=b(mol) (a,b>0) (nguyên, dương)
\(\Rightarrow\left\{{}\begin{matrix}32a+31b=22,2\\22,4a=11,2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,5\\b=0,2\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}\%m_S=\dfrac{0,5.32}{22,2}.100\approx72,072\%\\\%m_P\approx100\%-72,072\%\approx27,928\%\end{matrix}\right.\)
b)
\(n_{O_2}=a+\dfrac{5}{4}b=0,5+\dfrac{5}{4}.0,2=0,75\left(mol\right)\\ \Rightarrow V_{O_2\left(đktc\right)}=0,75.22,4=16,8\left(l\right)\)
c)
\(2KClO_3\rightarrow\left(t^o\right)2KCl+3O_2\\ n_{KClO_3}=\dfrac{2}{3}.n_{O_2}=\dfrac{2.0,75}{3}=0,5\left(mol\right)\\ \Rightarrow m_{KClO_3}=122,5.0,5=61,25\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
áp dụng định luật bảo toàn khối lượng ta có :
Σmhh + mo2 =ms02 + mco2 <=> 4,4 + 6,4 = mso2 + mco2 <=> mso2 + mco2 = 10,8
![](https://rs.olm.vn/images/avt/0.png?1311)
PTHH: \(2CuS+3O_2\xrightarrow[]{t^o}2CuO+2SO_2\uparrow\)
a____________a_______a (mol)
\(4FeS+7O_2\xrightarrow[]{t^o}2Fe_2O_3+4SO_2\)
2b_____________b_______2b (mol)
Ta lập hệ phương trình: \(\left\{{}\begin{matrix}96a+88\cdot2b=22,8\\a+2b=\dfrac{5,6}{22,4}=0,25\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,075\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{CuO}=\dfrac{0,1\cdot80}{0,1\cdot80+0,075\cdot160}\cdot100\%=40\%\\\%m_{Fe_2O_3}=60\%\end{matrix}\right.\)
a, \(n_{SO_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
PTHH: CuS + O2 ---to--> CuO + SO2
Mol: x x
PTHH: FeS + O2 ---to→ FeO + SO2
Mol: 0,25-x 0,25-x
Ta có: mFeS + mCuS = 22,8
⇔ (0,25-x).88 + x.96 = 22,8
⇔ 22-88x+96x=22,8
⇔ 8x=0,8
⇔ x=0,1
PTHH: CuS + O2 ---to--> CuO + SO2
Mol: 0,1 0,1 0,1
PTHH: FeS + O2 ---to→ FeO + SO2
Mol: 0,15 0,15 0,15
mhh = 0,1.96+0,15.88=22,8 (g)
⇒ \(\%m_{FeO}=\dfrac{0,15.88.100\%}{22,8}=57,9\%;\%m_{CuO}=\dfrac{0,1.96.100\%}{22,8}=42,1\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{hhkhí}=\dfrac{16,8}{22,4}=0,75\left(mol\right)\)
Gọi \(n_{SO_2}=a\left(mol\right)\left(0< a< 0,75\right)\)
\(\rightarrow n_{O_2\left(dư\right)}=0,75-b\left(mol\right)\)
Ta có: \(\dfrac{64a+32\left(0,75-a\right)}{0,75}=\dfrac{33,6}{1}=33,6\left(\dfrac{g}{mol}\right)\)
\(\rightarrow a=0,0375\left(mol\right)\)
\(\rightarrow\left\{{}\begin{matrix}\%V_{SO_2}=\dfrac{0,0375}{0,75}=5\%\\\%V_{O_2\left(dư\right)}=100\%-5\%=95\%\end{matrix}\right.\)
*Sửa đề: Thu được 13g hh sản phẩm
Bảo toàn khối lượng: \(m_{O_2\left(p.ứ\right)}=m_{hỗn.hợp}-\left(m_C+m_S\right)=13-5=8\left(g\right)\)
\(\Rightarrow n_{O_2}=\dfrac{8}{32}=0,25\left(mol\right)\) \(\Rightarrow V_{O_2}=0,25\cdot22,4=5,6\left(l\right)\)