Sửa đề : 11.2 (l)
\(n_{hh}=\dfrac{11.2}{22.4}=0.5\left(mol\right)\)
\(m_{Br_2}=320\cdot\dfrac{15}{100}=48\left(g\right)\)
\(n_{Br_2}=\dfrac{48}{160}=0.3\left(mol\right)\)
\(\)\(C_2H_2+2Br_2\rightarrow C_2H_2Br_4\)
\(0.15..........0.3\)
\(V_{CH_4}=0.5-0.15=0.35\left(mol\right)\)
\(\%C_2H_2=\dfrac{0.15}{0.5}\cdot100\%=30\%\)
\(\%CH_4=70\%\)