CH4 + 2O2 t0→ CO2 + 2H2O

C2H4 + 3O2 t0→ 2CO2 + 2H2O

C2H2 + 52 O2 t0→ 2CO2 + 2H2O

-Gọi:  nCH4:a(mol)

nC2H4:b(mol)

nC2H2:c(mol) 

⇒16a+28b+26c=11(1)

BTNT C ⇒a+2b+2c=0,75(2)

-Phân tích (1)và (2) ta được:

{13a+26b+26c=9,75

=>3a+2b=1,25(3)

16a+32b+32c=12

=>4b+6c=1(4)

-Từ (3) ⇒ \(a=\dfrac{1,25-2b}{3}\)

-Từ (4)⇒\(\dfrac{1-4c}{6}\)

-% CH4 =\(\dfrac{16a}{16a+32b+32c}.100\)

-Thay công thức a và c vào (⋅)

⇒%CH4=\(\dfrac{\dfrac{1,25-2b}{3}16}{16\dfrac{1,25-2b}{3}+28b+26.\dfrac{1-4b}{6}}100=12,12\%\)

\(n_{CH_4}=a\left(mol\right),n_{C_2H_2}=b\left(mol\right)\)

\(\Rightarrow m_A=16a+26b=8.4\left(g\right)\left(1\right)\)

\(n_{O_2}=\dfrac{28.8}{32}=0.9\left(mol\right)\)

\(CH_4+2O_2\underrightarrow{t^0}CO_2+2H_2O\)

\(C_2H_2+\dfrac{5}{2}O_2\underrightarrow{t^0}2CO_2+H_2O\)

\(\Rightarrow2a+\dfrac{3}{2}b=0.9\left(2\right)\)

\(\left(1\right),\left(2\right):a=b=0.2\)

\(m_{CH_4}=0.2\cdot16=3.2\left(g\right)\)

\(m_{C_2H_2}=0.2\cdot26=5.2\left(g\right)\)

Chúc em học tốt !!

\(m_{CH_4} = 8.30\% = 2,4(gam)\\ m_{C_2H_4} = 8 - 2,4 = 5,6(gam)\\ CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O\\ C_2H_4 + 3O_2 \xrightarrow{t^o} 2CO_2 + 2H_2O\\\)

Theo PTHH :

\(n_{CO_2} = n_{CH_4} + 2n_{C_2H_4} = \dfrac{2,4}{16} + \dfrac{5,6}{28}.2 = 0,55(mol)\\ \Rightarrow m_{CO_2} = 0,55.44 = 24,2(gam)\)

\(m_{CH_4}=0.3\cdot8=2.4\left(g\right)\)

\(n_{CH_4}=\dfrac{2.4}{16}=0.15\left(mol\right)\)

\(m_{C_2H_4}=8-2.4=5.6\left(g\right)\)

\(n_{C_2H_4}=\dfrac{5.6}{28}=0.2\left(mol\right)\)

\(CH_4+2O_2\underrightarrow{t^0}CO_2+2H_2O\)

\(C_2H_4+3O_2\underrightarrow{t^0}2CO_2+2H_2O\)

\(n_{CO_2}=2\cdot0.15+0.2=0.5\left(mol\right)\)

\(m_{CO_2}=0.5\cdot44=22\left(g\right)\)

a) 

n_Br2 = 0,2.0,2 = 0,04 (mol)

n_CaCO3 = \(\dfrac{10}{100}=0,1\left(mol\right)\)

PTHH: C₂H₄ + Br₂ --> C₂H₄Br₂

            0,04<--0,04---->0,04

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

             0,04--------------->0,08

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

           0,02<-------------0,02

             Ca(OH)₂ + CO₂ --> CaCO₃ + H₂O

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

=> \(\left\{{}\begin{matrix}\%V_{CH_4}=\dfrac{0,02}{0,02+0,04}.100\%=33,33\%\\\%V_{C_2H_4}=\dfrac{0,04}{0,02+0,04}.100\%=66,67\%\end{matrix}\right.\)

b) m_C2H4Br2 = 0,04.188 = 7,52 (g)

\(PTHH:CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\\ C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\\ Đặt:a=n_{CH_4}\left(mol\right);b=n_{C_2H_4}\left(mol\right)\left(a,b>0\right)\\ Có:\left\{{}\begin{matrix}22,4a+22,4b=8,96\\22,4a+44,8b=11,2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,3\\b=0,1\end{matrix}\right.\\ \%V_{CH_4}=\dfrac{a}{a+b}.100\%=\dfrac{0,3}{0,3+0,1}.100\%=75\%;\%V_{C_2H_4}=100\%-75\%=25\%\)