\(n_{CH_4}=\dfrac{5.6}{22.4}=0.25\left(mol\right)\)
\(m_{tăng}=m_{C_2H_4}=7\left(g\right)\)
\(m_{hh}=m_{CH_4}+m_{C_2H_4}=0.25\cdot16+7=11\left(g\right)\)
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