a, \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Ta có: \(n_{C_2H_4Br_2}=\dfrac{18,8}{188}=0,1\left(mol\right)\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=n_{C_2H_4Br_2}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%V_{C_2H_4}=\dfrac{0,1.22,4}{4,48}.100\%=50\%\\\%V_{CH_4}=50\%\end{matrix}\right.\)
b, \(C\%_{Br_2}=\dfrac{0,1.160}{100}.100\%=16\%\)