Ta có: \(n_{Br_2}=\dfrac{4}{160}=0,025\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,025\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,025.22,4}{5,6}.100\%=10\%\\\%V_{CH_4}=90\%\end{matrix}\right.\)