pthh: \(CH4+2O2->CO2+2H2O\)
\(=>nCH4=nCO2=a\left(mol\right)\)
pthh :\(2C2H2+5O2->4CO2+2H2O\)
\(=>nC2H2=y\left(mol\right),nCO2=2y\left(mol\right)\)
\(=>\left\{{}\begin{matrix}x+y=\dfrac{4,48}{22,4}=0,2\\x+2y=\dfrac{13,2}{44}=0,3\end{matrix}\right.=>\left\{{}\begin{matrix}x=0,1mol\\y=0,1mol\end{matrix}\right.\)
\(=>m\left(CH4\right)=0,1.16=1,6g\)
\(=>m\left(C2H2\right)=0,1.26=2,6g\)