a. \(n_{CH_4}=\dfrac{10.08}{22,4}=0,45\left(mol\right)\)

PTHH : CH₄ + 2O₂ ----t^o---> CO₂ + 2H₂O

         0,45    0,9              0,45

\(V_{O_2}=0,9.22,4=20,16\left(l\right)\)

\(V_{kk}=20,16.5=100,8\left(l\right)\)

b. \(m_{CO_2}=0,45.44=19,8\left(g\right)\)

c. PTHH : 2KMnO₄ -> K₂MnO₄ + MnO₂ + O₂

              1,8                               0,9

\(m_{KMnO_4}=1,8.158=284,4\left(g\right)\)

Bài 2:

Ta có n_Fe3O4 = 

Bài 1:

Ta có n_CH4 = 

\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\\ n_{CH_4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ n_{CO_2}=n_{CH_4}=0,2\left(mol\right)\\ n_{O_2}=2.n_{CH_4}=2.0,2=0,4\left(mol\right)\\ a,V_{kk}=5.V_{O_2\left(đktc\right)}=5.\left(0,4.22,4\right)=44,8\left(l\right)\\ b,m_{CO_2}=0,2.44=8,8\left(g\right)\)

a) 

\(n_{CH_4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)

PTHH: CH₄ + 2O₂ --t^o--> CO₂ + 2H₂O

            0,5--->1

=> V_O2 = 1.22,4 = 22,4 (l)

b) 

V_O2 = 22,4.2 = 44,8 (l)

=> V_kk = 44,8.5 = 224 (l)

Sửa đề: 13,4 (l) → 13,44 (l)

Ta có: \(n_{CH_4}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)

PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

_____0,6___1,2___0,6 (mol)

a, \(V_{O_2}=1,2.22,4=26,88\left(l\right)\)

b, \(V_{CO_2}=0,6.22,4=13,44\left(l\right)\)

c, \(V_{kk}=5V_{O_2}=134,4\left(l\right)\)

\(n_{O_2}=\dfrac{6,72}{22,4}=0,3mol\)

Gọi \(\left\{{}\begin{matrix}n_{CH_4}=x\\n_{C_2H_4}=y\end{matrix}\right.\)

\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)

  x         2x                                      ( mol )

\(C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\)

   y          3y                                       ( mol )

Ta có:

\(\left\{{}\begin{matrix}16x+28y=2,6\\2x+3y=0,3\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,075\\y=0,05\end{matrix}\right.\)

\(\Rightarrow m_{CH_4}=0,075.16=1,2g\)

\(\Rightarrow m_{C_2H_4}=0,05.28=1,4g\)

\(\%m_{CH_4}=\dfrac{1,2}{2,6}.100=46,15\%\)

\(\%m_{C_2H_4}=100\%-46,15\%=53,85\%\)

\(n_{CH_4}=22,4.0,075=1,68l\)

\(n_{C_2H_4}=0,05.22,4=1,12l\)

nCH4 = 2.24/22.4 = 0.1 (mol) 

CH4 + 2O2 -to-> CO2 + 2H2O 

0.1____0.2______0.1 

VO2 = 0.2*22.4 = 4.48 (l) 

VCO2 = 0.1*22.4=2.24 (l) 

\(CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ V_{O_2} = 2V_{CH_4} = 2,24.2 = 4,48(lít)\\ V_{CO_2} = V_{CH_4} = 2,24(lít)\)

CH4 + 2O2 → CO2 + 2H2O

\(n_{CH4}\)=\(\dfrac{n_{CH4}}{22.4}=\)\(\dfrac{2.24}{22.4}=0.1\)mol

\(n_{O2}=\dfrac{0,1.2}{1}=0.2\)mol

\(V_{O2}=n_{O2}.22,4=0,2.22,4=4.48\)l

\(n_{CO2}=\dfrac{0,1.1}{1}0.1\)mol

\(V_{CO2}=n_{CO2}.22,4=0,1.22,4=2.24\)l

CH₄+2O₂-to>CO₂+2H₂O

0,25----0,5 mol

n CH4=\(\dfrac{5,6}{22,4}\)=0,25 mol

=>Vkk=0,5.22,4.5=56l

\(n_{CH_4}=\dfrac{3,36}{22,4}=0,15mol\)

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

0,15     0,3

\(V_{O_2}=0,3\cdot22,4=6,72l\)

\(\Rightarrow V_{kk}=5V_{O_2}=5\cdot6,72=33,6l\)

Không có đáp án đúng!

PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

Ta có: \(n_{CH_4}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)

a, Theo PT: \(n_{O_2}=2n_{CH_4}=1\left(mol\right)\)

\(\Rightarrow V_{O_2}=1.22,4=22,4\left(l\right)\)

b, \(V_{kk}=\dfrac{22,4}{20\%}=112\left(l\right)\)

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

0.15     0.3      0.15

\(n_{CH_4}=\dfrac{3.36}{22.4}=0.15mol\)

\(V_{O_2}=0.3\times22.4=6.72l\)

\(V_{CO_2}=0.15\times22.4=3.36l\)