\(n_{CH_4}=a\left(mol\right),n_{C_2H_2}=b\left(mol\right)\)
\(\Rightarrow m_A=16a+26b=8.4\left(g\right)\left(1\right)\)
\(n_{O_2}=\dfrac{28.8}{32}=0.9\left(mol\right)\)
\(CH_4+2O_2\underrightarrow{t^0}CO_2+2H_2O\)
\(C_2H_2+\dfrac{5}{2}O_2\underrightarrow{t^0}2CO_2+H_2O\)
\(\Rightarrow2a+\dfrac{3}{2}b=0.9\left(2\right)\)
\(\left(1\right),\left(2\right):a=b=0.2\)
\(m_{CH_4}=0.2\cdot16=3.2\left(g\right)\)
\(m_{C_2H_2}=0.2\cdot26=5.2\left(g\right)\)
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