CH4 + 2 O2 - > CO2 + 2 H2O
a............2a..........a
C4H10 + 13/2 O2 -> 4 CO2 + 5 H2O
b..................6,5b..............4b
16a+ 58b = 7,4
44a + 44 .4b = 22
=> a = b = 0,1
m O2 = 32 (2.0,1 + 6,5.0,1) = 27,2 g

CH₄ + 2 O₂ - > CO₂ + 2 H₂O
a............2a..........a
C₄H₁₀ + 13/2 O₂ -> 4 CO₂ + 5 H₂O
b..................6,5b..............4b
16a+ 58b = 7,4
44a + 44 .4b = 22
=> a = b = 0,1
m O₂ = 32 (2.0,1 + 6,5.0,1) = 27,2 g

H4 + 2 O2 - > CO2 + 2 H2O
a............2a..........a
C4H10 + 13/2 O2 -> 4 CO2 + 5 H2O
b..................6,5b..............4b
16a+ 58b = 7,4
44a + 44 .4b = 22
=> a = b = 0,1
m O2 = 32 (2.0,1 + 6,5.0,1) = 27,2 g

16n_metan+58n_butan=7,4 (1).

BT C: n_metan+4n_butan=22/44=0,5 (2).

Giải hệ phương trình gồm (1) và (2), ta suy ra n_metan=0,1 (mol) và n_butan=0,1 (mol).

Số mol nước tạo ra là 0,5.(0,1.4+0,1.10)=0,7 (mol).

BTKL: 7,4+32n_{khí oxi}=22+0,7.18, suy ra n_{khí oxi}=0,85 (mol).

Thể tích khí oxi cần tìm là 0,85.22,4=19,04 (lít).

\(n_{CO_2}=\dfrac{22}{44}=0,5mol\)

Gọi \(\left\{{}\begin{matrix}n_{CH_4}=x\\n_{C_4H_{10}}=y\end{matrix}\right.\)

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

  x        2x                  x                    ( mol )

\(2C_4H_{10}+13O_2\rightarrow\left(t^o\right)8CO_2+10H_2O\) 

     y         13/2 y              4y                       ( mol )

Ta có:

\(\left\{{}\begin{matrix}16x+58y=7,4\\x+4y=0,5\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\)

\(\Rightarrow n_{O_2}=2.0,1+\dfrac{13}{2}.0,1=0,85mol\)

\(V_{O_2}=0,85.22,4=19,04l\)

PTHH: \(CH_4+2O_2\rightarrow^{t^o}CO_2+2H_2O\)

\(2C_4H_{10}+13O_2\rightarrow^{t^o}8CO_2+10H_2O\)

Đặt \(\hept{\begin{cases}x\left(mol\right)=CH_4\\y\left(mol\right)=C_4H_{10}\end{cases}}\), có hệ phương trình sau

\(\hept{\begin{cases}16x+58y=7,4\\44x+176y=22\end{cases}}\)

\(\Leftrightarrow x=y=0,1\)

Dưa vào PTHH 1: \(n_{O_2}=2x=0,1.2=0,2mol\)

Dựa vào PTHH 2: \(n_{O_2}=\frac{13.0,1}{2}=0,65mol\)

Có tổng số mol của \(O_2\) là: \(0,2+0,65=0,85mol\)

\(\rightarrow m_{O_2}=32.0,85=27,2g\)

\(a,Đặt:n_{CH_4}=a\left(mol\right);n_{C_4H_{10}}=b\left(mol\right)\left(a,b>0\right)\\ PTHH:CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\\ 2C_4H_{10}+13O_2\rightarrow\left(t^o\right)8CO_2+10H_2O\\ \Rightarrow\left\{{}\begin{matrix}16a+58b=7,4\\22,4a+22,4.4b=22\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,1\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}m_{CH_4}=0,1.16=1,6\left(g\right)\\m_{C_4H_{10}}=0,1.58=5,8\left(g\right)\end{matrix}\right.\\ b,n_{O_2}=2a+\dfrac{13}{2}b=2.0,1+6,5.0,1=0,85\left(mol\right)\\ \Rightarrow V_{O_2\left(đktc\right)}=0,85.22,4=19,04\left(l\right)\)

a, Ta có: \(n_{CO_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)=n_C\)

\(n_{H_2O}=\dfrac{10,8}{18}=0,6\left(mol\right)\Rightarrow n_H=0,6.2=1,2\left(mol\right)\)

m = m_C + m_H = 0,4.12 + 1,2.1 = 6 (g)

b, Theo ĐLBT KL, có: m + m_O2 = m_CO2 + m_H2O

⇒ m_O2 = 22,4 (g) \(\Rightarrow n_{O_2}=\dfrac{22,4}{32}=0,7\left(mol\right)\)

\(\Rightarrow V_{O_2}=0,7.22,4=15,68\left(g\right)\)

\(\Rightarrow V_{kk}=\dfrac{15,68}{20\%}=78,4\left(g\right)\)

a)

$CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O$

b) $n_{CH_4} = \dfrac{28}{22,4} = 1,25(mol)$

$n_{CO_2} = n_{CH_4} = 1,25(mol)$
$m_{CO_2} = 1,25.44 = 55(gam)$

c) $V_{O_2} =2 V_{CH_4} = 56(lít)$