\(Gọi : n_{C_2H_4} = a; n_{C_2H_2} = b\\ \Rightarrow a + b = \dfrac{5,6}{22,4} = 0,25(1)\\ C_2H_4 + Br_2 \to C_2H_4Br_2\\ C_2H_2 + 2Br_2 \to C_2H_2Br_4\\ n_{Br_2} = a + 2b = \dfrac{56}{160} =0,35(2)\\ (1)(2)\Rightarrow a = 0,15 ; b = 0,1\\ \Rightarrow \%V_{C_2H_4} = \dfrac{0,15}{0,25} .100\% = 60\%\\ \%V_{C_2H_2} = 100\% -60\% = 40\%\)