bài tập 2  

3Fe    +   2O2  -\(-^{t^o}->\)    Fe3O4 (1)

ADCT     n= m/M

\(n_{fe_3O_4}\)=  11,6/  232= 0,05 mol

Theo pt(1) có

\(\dfrac{n_{O2}}{n_{Fe3O4}}\)=\(\dfrac{2}{1}\)

-> \(n_{O2}\)=    2/1 x \(n_{fe3o4}\)

           =   0,1 mol

ADCT      V= n x 22,4

Vo2=   0,1 x 22,4

      =    2,24 (l)

bài tập 4

OXIT AXIT:

- CO2:   Cacbon đi oxit

- N2O:   đi ni tơ oxit

- SO3:  Lưu huỳnh tri oxit

- CO: cacbon oxit

P2O5:   đi photpho penta oxit

NO2:   Nitơ đi oxit

OXIT BA ZƠ

- HgO: thủy ngân (II) oxit

- MgO: Magie oxit

- FeO: sắt (II) oxit

- Li2O:  liti oxit

-CaO: canxi oxit

- BaO:  bari oxit

- Na2O: natri oxit

- Al2O3 :  Nhôm oxit

ZnO: kẽm oxit

Bổ sung bài 3:

\(a,n_{SO_2}=\dfrac{6,4}{64}=0,1\left(mol\right)\\ PTHH:S+O_2\underrightarrow{t^o}SO_2\\ \left(mol\right)..0,1...0,1\leftarrow0,1\\ b,m_S=0,1.32=3,2\left(g\right)\\ c,V_{O_2}=0,1.22,4=2,24\left(l\right)\\ d,V_{kk}=5.V_{O_2}=5.2,24=11,2\left(l\right)\)

$2CO+O_2\rightarrow 2CO_2$

$2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O$

$4Na+O_2\rightarrow 2Na_2O$

$2Zn+O_2\rightarrow 2ZnO$

$4Al+3O_2\rightarrow 2Al_2O_3$

\(2CO+O_2\underrightarrow{t^o}2CO_2\)

\(2C_2H_6+7O_2\underrightarrow{t^o}6CO_2+4H_2O\)

\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)

2CO + O₂ ---t^o---> 2CO₂.

2C₂H₆ + 7O₂ ---t^o---> 4CO₂ + 6H₂O.

4Na + O₂ ---t^o---> 2Na₂O.

2Zn + O₂ ---t^o---> 2ZnO.

4Al + 3O₂ ---t^o---> 2Al₂O₃.

\(2H_2+O_2\underrightarrow{t^o}2H_2O\\ 4K+O_2\underrightarrow{t^o}2K_2O\\ Zn+O_2\underrightarrow{t^o}ZnO\\ S+O_2\underrightarrow{t^o}SO_2\\ 2S+3O_2\underrightarrow{t^o}2SO_3\\ 4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)

\(2C+O_2\underrightarrow{t^o}2CO\\ C+O_2\underrightarrow{t^o}CO_2\\ 2Ba+O_2\underrightarrow{t^o}2BaO\\ 2Fe+O_2\underrightarrow{t^o}2FeO\\ 4Fe+3O_2\underrightarrow{t^o}2Fe_2O_3\\ 3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)

H2+ 1/2O2 --> H2O
S+O2 -->SO2
C+ O2--> CO2
4Al+ 3O2-->2Al2O3
 

Bàu 1

a) 4P+5O2--->2P2O5

S+O2--->SO2

3Fe+2O2--->Fe3O4

C2H4+3O2-->2CO2+2H2O

4Na+O2--->2Na2O

trừ phản ứng C2H4 thì tất cả đề là phản ứng hóa hợp

Bài 2

2H2+O2--->2H2O

2Mg+O2--->2MgO

2Cu+O2--->2CuO

S+O2--->SO2

4Al+3O2--->2Al2O3

C+O2---->CO2

4P+5O2--->2P2O5

Bài 1 :

a,

\(4P+5O_2\underrightarrow{^{to}}2P_2O_5\) (1)

\(S+O_2\underrightarrow{^{to}}SO_2\)(2)

\(3Fe+2O_2\underrightarrow{^{to}}Fe_3O_4\)(3)

\(C_2H_4+3O_2\underrightarrow{^{to}}2CO_2\uparrow+2H_2O\)(4)

\(4Na+O_2\underrightarrow{^{to}}2Na_2O\)(5)

\(2Ca+O_2\underrightarrow{^{to}}2CaO\)(6)

b, PHản ứng hóa hợp : (1) ; (2) ; (3) ;(5) ; (6)

Bài 2 :

\(2H_2+O_2\underrightarrow{^{to}}2H_2O\)

\(2Mg+O_2\underrightarrow{^{to}}2MgO\)

\(2Cu+O_2\underrightarrow{^{to}}2CuO\)

\(S+O_2\underrightarrow{^{to}}SO_2\)

\(4Al+3O_2\underrightarrow{^{to}}2Al_3O_3\)

\(C+O_2\underrightarrow{^{to}}CO_2\)

\(4P+5O_2\underrightarrow{^{to}}2P_2O_5\)

a, PT: \(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)

Tỉ lệ: n_Al : n_O2 = 4:3

b, Phần này bạn xem lại đề nhé!

\(1,2H_2+O_2\underrightarrow{t}2H_2O\)

\(2Mg+O_2\underrightarrow{t}2MgO\)

\(2Cu+O_2\underrightarrow{t}2CuO\)

\(S+O_2\underrightarrow{t}SO_2\)

\(4Al+3O_2\underrightarrow{t}2Al_2O_3\)

\(C+O_2\underrightarrow{t}CO_2\)

\(4P+5O_2\underrightarrow{t}2P_2O_5\)

\(2,PTHH:C+O_2\underrightarrow{t}CO_2\)

\(a,n_{O_2}=0,2\left(mol\right)\Rightarrow n_{CO_2}=0,2\left(mol\right)\Rightarrow m_{CO_2}=8,8\left(g\right)\)

\(b,n_C=0,3\left(mol\right)\Rightarrow n_{CO_2}=0,3\left(mol\right)\Rightarrow m_{CO_2}=13,2\left(g\right)\)

c, Vì\(\frac{0,3}{1}>\frac{0,2}{1}\)nên C phản ửng dư, O₂ phản ứng hết, Bài toán tính theo O₂

\(n_{O_2}=0,2\left(mol\right)\Rightarrow n_{CO_2}=0,2\left(mol\right)\Rightarrow m_{CO_2}=8,8\left(g\right)\)

\(3,PTHH:CH_4+2O_2\underrightarrow{t}CO_2+2H_2O\)

\(C_2H_2+\frac{5}{2}O_2\underrightarrow{t}2CO_2+H_2O\)

\(C_2H_6O+3O_2\underrightarrow{t}2CO_2+3H_2O\)

\(4,a,PTHH:4P+5O_2\underrightarrow{t}2P_2O_5\)

\(n_P=1,5\left(mol\right)\Rightarrow n_{O_2}=1,2\left(mol\right)\Rightarrow m_{O_2}=38,4\left(g\right)\)

\(b,PTHH:C+O_2\underrightarrow{t}CO_2\)

\(n_C=2,5\left(mol\right)\Rightarrow n_{O_2}=2,5\left(mol\right)\Rightarrow m_{O_2}=80\left(g\right)\)

\(c,PTHH:4Al+3O_2\underrightarrow{t}2Al_2O_3\)

\(n_{Al}=2,5\left(mol\right)\Rightarrow n_{O_2}=1,875\left(mol\right)\Rightarrow m_{O_2}=60\left(g\right)\)

\(d,PTHH:2H_2+O_2\underrightarrow{t}2H_2O\)

\(TH_1:\left(đktc\right)n_{H_2}=1,5\left(mol\right)\Rightarrow n_{O_2}=0,75\left(mol\right)\Rightarrow m_{O_2}=24\left(g\right)\)

\(TH_2:\left(đkt\right)n_{H_2}=1,4\left(mol\right)\Rightarrow n_{O_2}=0,7\left(mol\right)\Rightarrow m_{O_2}=22,4\left(g\right)\)

\(5,PTHH:S+O_2\underrightarrow{t}SO_2\)

\(n_{O_2}=0,46875\left(mol\right)\)

\(n_{SO_2}=0,3\left(mol\right)\)

Vì\(0,46875>0,3\left(n_{O_2}>n_{SO_2}\right)\)nên S phản ứng hết, bài toán tính theo S.

\(a,\Rightarrow n_S=n_{SO_2}=0,3\left(mol\right)\Rightarrow m_S=9,6\left(g\right)\)

\(n_{O_2}\left(dư\right)=0,16875\left(mol\right)\Rightarrow m_{O_2}\left(dư\right)=5,4\left(g\right)\)

\(6,a,PTHH:C+O_2\underrightarrow{t}CO_2\)

\(n_{O_2}=1,5\left(mol\right)\Rightarrow n_C=1,5\left(mol\right)\Rightarrow m_C=18\left(g\right)\)

\(b,PTHH:2H_2+O_2\underrightarrow{t}2H_2O\)

\(n_{O_2}=1,5\left(mol\right)\Rightarrow n_{H_2}=0,75\left(mol\right)\Rightarrow m_{H_2}=1,5\left(g\right)\)

\(c,PTHH:S+O_2\underrightarrow{t}SO_2\)

\(n_{O_2}=1,5\left(mol\right)\Rightarrow n_S=1,5\left(mol\right)\Rightarrow m_S=48\left(g\right)\)

\(d,PTHH:4P+5O_2\underrightarrow{t}2P_2O_5\)

\(n_{O_2}=1,5\left(mol\right)\Rightarrow n_P=1,2\left(mol\right)\Rightarrow m_P=37,2\left(g\right)\)

\(7,n_{O_2}=5\left(mol\right)\Rightarrow V_{O_2}=112\left(l\right)\left(đktc\right)\);\(V_{O_2}=120\left(l\right)\left(đkt\right)\)

\(8,PTHH:C+O_2\underrightarrow{t}CO_2\)

\(m_C=0,96\left(kg\right)\Rightarrow n_C=0,08\left(kmol\right)=80\left(mol\right)\Rightarrow n_{O_2}=80\left(mol\right)\Rightarrow V_{O_2}=1792\left(l\right)\)

\(9,n_p=0,2\left(mol\right);n_{O_2}=0,3\left(mol\right)\)

\(PTHH:4P+5O_2\underrightarrow{t}2P_2O_5\)

Vì\(\frac{0,2}{4}< \frac{0,3}{5}\)nên P hết O2 dư, bài toán tính theo P.

\(a,n_{O_2}\left(dư\right)=0,05\left(mol\right)\Rightarrow m_{O_2}\left(dư\right)=1,6\left(g\right)\)

\(b,n_{P_2O_5}=0,1\left(mol\right)\Rightarrow m_{P_2O_5}=14,2\left(g\right)\)

đủ cả 9 câu bạn nhé,

Bài 1 : 

a. \(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)

\(n_{O_2}=\dfrac{16}{32}=0,5\left(mol\right)\)

b. PTHH : 4Al + 3O₂ -t^o> 2Al₂O₃

                 0,4       0,3       0,2

Xét tỉ lệ : \(\dfrac{0,4}{4}< \dfrac{0,5}{3}\) => Al đủ , O₂ dư

\(m_{O_2\left(dư\right)}=\left(0,5-0,3\right).32=6,4\left(g\right)\)

c. \(m_{Al_2O_3}=0,2.102=20,4\left(g\right)\)

Bài 2:

Bài 1:

a) 2CuFeS₂ + \(\dfrac{13}{2}\)O₂ --t^o--> 2CuO + Fe₂O₃ + 4SO₂

b) \(n_{CuFeS_2}=\dfrac{3,68}{184}=0,02\left(mol\right)\)

\(n_{O_2}=\dfrac{1,68}{22,4}=0,075\left(mol\right)\)

Xét tỉ lệ: \(\dfrac{0,02}{2}< \dfrac{0,075}{\dfrac{13}{2}}\) => CuFeS₂ hết, O₂ dư

PTHH: 2CuFeS₂ + \(\dfrac{13}{2}\)O₂ --t^o--> 2CuO + Fe₂O₃ + 4SO₂

              0,02----->0,065------->0,02---->0,01---->0,04

=> \(\left\{{}\begin{matrix}n_{O_2\left(dư\right)}=0,075-0,065=0,01\left(mol\right)\\n_{SO_2}=0,04\left(mol\right)\end{matrix}\right.\)

=> \(\left\{{}\begin{matrix}\%V_{O_2}=\dfrac{0,01}{0,01+0,04}.100\%=20\%\\\%V_{SO_2}=\dfrac{0,04}{0,01+0,04}.100\%=80\%\end{matrix}\right.\)

- \(\left\{{}\begin{matrix}m_{CuO}=0,02.80=1,6\left(g\right)\\m_{Fe_2O_3}=0,01.160=1,6\left(g\right)\end{matrix}\right.\)

=> m_rắn = 1,6 + 1,6 = 3,2 (g)

Bài 2: 

a) 

2CuS + 3O₂ --t^o--> 2CuO + 2SO₂

4FeS + 7O₂ --t^o--> 2Fe₂O₃ + 4SO₂

b) Gọi số mol CuS, FeS là a, b (mol)

=> 96a + 88b = 22,8 (1)

\(n_{SO_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

=> a + b = 0,25 (2)

(1)(2) => a = 0,1; b = 0,15

=> \(\left\{{}\begin{matrix}n_{CuO}=0,1\left(mol\right)\\n_{Fe_2O_3}=0,075\left(mol\right)\end{matrix}\right.\)

=> \(\left\{{}\begin{matrix}\%m_{CuO}=\dfrac{0,1.80}{0,1.80+0,075.160}.100\%=40\%\\\%m_{Fe_2O_3}=\dfrac{0,075.160}{0,1.80+0,075.160}.100\%=60\%\end{matrix}\right.\)

\(a.Al+2HCl\rightarrow AlCl_3+H_2\)

\(b.4P+5O_2\underrightarrow{t^o}2P_2O_5\)