Ta có: \(n_{Br_2}=\dfrac{32}{160}=0,2\left(mol\right)\)
PT: \(C_2H_4+Br_2\rightarrow C_2H_4Br_2\)
Theo PT: \(n_{C_2H_4}=n_{Br_2}=0,2\left(mol\right)\)
\(\Rightarrow V_{C_2H_4}=0,2.22,4=4,48\left(l\right)\)
\(\Rightarrow V_{CH_4}=7,72-4,48=3,24\left(l\right)\)