nO2(tổng)=0,3(mol); nCO2=0,2(mol)

CO + 1/2 O2 -to-> CO2 (1)

0,2<----0,1<-------0,2(mol)

H2 + 1/2 O2 -to-> H2O (2)

0,4<---0,2<-------0,4(mol)

nO2(2)= nO2(tổng)- nO2(1)=0,3-0,1=0,2(mol)

Vì số mol tỉ lệ thuận thể tích:

=> %V(CO/hh)= [0,2/(0.2+0,4)].100=33,333%

=>%V(H2/hh)=100%-33,333%=66,667%

a) 

\(n_{Br_2}=\dfrac{8}{160}=0,05\left(mol\right)\)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

             0,05<-0,05

=> \(n_{CH_4}=\dfrac{3,36}{22,4}-0,05=0,1\left(mol\right)\)

\(\%m_{CH_4}=\dfrac{0,1.16}{0,1.16+0,05.28}.100\%=53,33\%\)

\(\%m_{C_2H_4}=\dfrac{0,05.28}{0,1.16+0,05.28}.100\%=46,67\%\)

b)

PTHH: CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

            0,1-->0,2

            C₂H₄ + 3O₂ --t^o--> 2CO₂ + 2H₂O

           0,05--->0,15

=> \(V_{O_2}=\left(0,2+0,15\right).22,4=7,84\left(l\right)\)

a. Gọi số mol của H₂, CO lần lượt là a,b.

\(\Rightarrow2a+28b=68\left(1\right)\)

 \(n_{O_2\left(đktc\right)}=\dfrac{V}{22,4}=\dfrac{89,6}{22,4}=4\left(mol\right)\)

 \(2H_2+O_2\rightarrow^{t^0}2H_2O\)

  2     :   1                   (mol)

  a     :    \(\dfrac{a}{2}\)                 (mol)

 \(2CO+O_2\rightarrow^{t^0}2CO_2\)

  2     :   1                   (mol)

  b     :    \(\dfrac{b}{2}\)                 (mol)

\(\Rightarrow\dfrac{a+b}{2}=4\left(2\right)\)

-Từ (1) và (2) suy ra: \(b=2;a=6\)

\(\%m_{H_2}=\dfrac{2a}{68}.100\%=\dfrac{2.6}{68}.100\%\approx17,65\%\)

\(\%m_{CO}=\dfrac{28b}{68}.100\%=\dfrac{28.2}{68}.100\%\approx82,35\%\)

\(V_{H_2}=n.22,4=6.22,4=134,4\left(l\right)\)

\(V_{CO}=n.22,4=2.22,4=44,8\left(l\right)\)

\(\%V_{H_2}=\dfrac{134,4}{134,4+44,8}.100\%=75\%\)

\(\%V_{CO}=\dfrac{44,8}{134,4+44,8}.100\%=25\%\)

đề có nhầm gì không vậy 68g thì lượng oxi quá ít.-.

a) 

Gọi số mol H₂, CO là a, b (mol)

=> 2a + 28b = 68 (1)

\(n_{O_2}=\dfrac{89,6}{22,4}=4\left(mol\right)\)

PTHH: 2H₂ + O₂ --t^o--> 2H₂O

             a--->0,5a

             2CO + O₂ --t^o--> 2CO₂

               b--->0,5b

=> 0,5a + 0,5b = 4 (2)

(1)(2) => a = 6 (mol); b = 2 (mol)

\(\left\{{}\begin{matrix}\%m_{H_2}=\dfrac{6.2}{68}.100\%=17,647\%\\\%m_{CO}=\dfrac{2.28}{68}.100\%=82,353\%\end{matrix}\right.\)

\(\left\{{}\begin{matrix}\%V_{H_2}=\dfrac{6}{2+6}.100\%=75\%\\\%V_{CO}=\dfrac{2}{2+6}.100\%=25\%\end{matrix}\right.\)

b) Đốt cháy 2 khí trong O₂ dư, dẫn sản phẩm thu được qua dd Ca(OH)₂ dư:

+ Không hiện tượng: H₂

2H₂ + O₂ --t^o--> 2H₂O

+ Kết tủa trắng: CO

2CO + O₂ --t^o--> 2CO₂

CO₂ + Ca(OH)₂ --> CaCO₃ + H₂O

a)

\(n_{O_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

\(n_{H_2O}=\dfrac{1,8}{18}=0,1\left(mol\right)\)

PTHH: 2H₂ + O₂ --t^o--> 2H₂O

            0,1<-0,05<-------0,1

            2CO + O₂ --t^o--> 2CO₂

            0,2<--0,1-------->0,2

=> \(\left\{{}\begin{matrix}V_{H_2}=0,1.22,4=2,24\left(l\right)\\V_{CO}=0,2.22,4=4,48\left(l\right)\end{matrix}\right.\)

b) \(m_{CO_2}=0,2.44=8,8\left(g\right)\)

\(n_{O_2}=\dfrac{3,36}{22,4}=0,15mol\)

\(n_{H_2O}=\dfrac{1,8}{18}=0,1mol\)

\(2CO+O_2\rightarrow2CO_2\)

  a         0,5a     a

\(2H_2+O_2\rightarrow2H_2O\)

 0,1   0,05 \(\leftarrow\)    0,1

\(\Sigma n_{O_2}=0,5a+0,05=0,15\)

\(\Rightarrow a=n_{O_2\left(CO\right)}=0,2mol\)

\(V_{CO}=2\cdot0,2\cdot22,4=8,96l\)

\(V_{H_2}=0,1\cdot22,4=2,24l\)

\(m_{CO_2}=0,2\cdot44=8,8g\)

\(n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

PTHH:

2CO + O₂ --t^o--> 2CO₂

0,2<---0,1<--------0,2

2H₂ + O₂ --t^o--> 2H₂O

0,4<--0,2<-------0,2

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CO}=\dfrac{0,2}{0,2+0,4}.100\%=33,33\%\\\%V_{H_2}=100\%-33,33\%=66,67\%\end{matrix}\right.\)

\(n_{CO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ n_{O_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

PTHH: 2CO + O₂ --t^o--> 2CO₂

            0,3<--0,15<------0,3

            2H₂ + O₂ --t^o--> 2H₂O

            0,1<--0,05

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CO}=\%n_{CO}=\dfrac{0,3}{0,3+0,1}.100\%=75\%\\\%V_{H_2}=100\%-75\%=25\%\end{matrix}\right.\)

a, \(CH_4+2O_2\underrightarrow{t^o}CO_2+H_2O\)

\(2C_2H_2+5O_2\underrightarrow{t^o}4CO_2+2H_2O\)

Ta có: \(n_{CH_4}+n_{C_2H_2}=\dfrac{33,6}{22,4}=1,5\left(mol\right)\left(1\right)\)

Theo PT: \(n_{CO_2}=n_{CH_4}+2n_{C_2H_2}=\dfrac{56}{22,4}=2,5\left(mol\right)\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CH_4}=0,5\left(mol\right)\\n_{C_2H_2}=1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,5.22,4}{33,6}.100\%\approx33,33\%\\\%V_{C_2H_2}\approx66,67\%\end{matrix}\right.\)

b, Theo PT: \(n_{O_2}=2n_{CH_4}+\dfrac{5}{2}n_{C_2H_2}=3,5\left(mol\right)\Rightarrow m_{O_2}=3,5.32=112\left(g\right)\)

a) PTHH: \(2CO+O_2\underrightarrow{t^o}2CO_2\)  (1)

                \(4H_2+O_2\underrightarrow{t^o}2H_2O\)  (2)

b) Ta có: \(\left\{{}\begin{matrix}\Sigma n_{O_2}=\dfrac{9,6}{32}=0,3\left(mol\right)\\n_{CO_2}=\dfrac{8,8}{44}=0,2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}n_{O_2\left(1\right)}=0,1mol\\n_{O_2\left(2\right)}=0,2mol\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}m_{CO}=0,1\cdot28=2,8\left(g\right)\\m_{H_2}=0,2\cdot2=0,4\left(g\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}\%m_{CO}=\dfrac{2,8}{2,8+0,4}\cdot100\%=87,5\%\\\%m_{H_2}=12,5\%\end{matrix}\right.\)

c) PTHH: \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\uparrow\)

Theo PTHH: \(n_{KMnO_4}=2n_{O_2}=0,6mol\)

\(\Rightarrow m_{KMnO_4}=0,6\cdot158=94,8\left(g\right)\)

CH4+2O2-to>CO2+2H2O

x----------------------------2x

2H2+O2-to>2H2O

y-------------------y

=>ta có :\(\left\{{}\begin{matrix}16x+2y=10\\2x+y=2\end{matrix}\right.\)

=>x=0,5 , y=1 mol

=>%m CH4=\(\dfrac{0,5.16}{10}100\)=80%

=>%m H2=20%