Ta có:
\(n_{CO2}=\frac{6,6}{44}=0,15\left(mol\right)\)
Số C \(=\frac{0,15}{0,1}=1,5\left(mol\right)\)
Gọi \(\left\{{}\begin{matrix}n_{HCOOH}:x\left(mol\right)\\n_{CH3COOH}:y\left(mol\right)\end{matrix}\right.\)
\(\left\{{}\begin{matrix}x+y=0,1\\x+\frac{2y}{x+y}=1,5\end{matrix}\right.\Rightarrow x=y=0,05\)
\(\Rightarrow m=5,3\left(g\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{HCOOH}=\frac{0,05.46}{5,3}.100\%=43,4\%\\\%m_{CH3COOH}=100\%-43,4\%=56,6\%\end{matrix}\right.\)