a) \(CH_4+2O_2\rightarrow CO_2+2H_2O\left(1\right)\)
\(C_2H_4+3O_2\rightarrow2CO_2+2H_2O\left(2\right)\)
b) \(n\left(CO_2\right)=\dfrac{14,874}{24,79}=0,6\left(mol\right)\)
Gọi \(n\left(CH_4\right)=x;n\left(C_2H_4\right)=y\)
\(\left(1\right);\left(2\right)\Rightarrow\left\{{}\begin{matrix}x+2y=0,6\\x+y=\dfrac{9,916}{24,79}=0,4\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,2\\y=0,2\end{matrix}\right.\)
\(m\left(CH_4\right)=0,2.16=3,2\left(g\right)\)
\(m\left(C_2H_4\right)=0,2.28=5,6\left(g\right)\)
\(C\%\left(CH_4\right)=\dfrac{3,2}{3,2+5,6}.100\%=36,36\%\)
\(C\%\left(C_2H_4\right)=100\%-36,36\%=63,64\%\)