\(n_X=\frac{6.72}{22.4}=0.3mol\)
\(C_3H_8+5O_2\rightarrow3CO_2+4H_2O\)
..x...........-->...........3x...-->.....4x
\(2C_3H_6+9O_2\rightarrow6CO_2+8H_2O\)
..y.........-->...............3y.....-->....4y
Ta có hệ:\(\left\{{}\begin{matrix}44x+42y=12.8\\x+y=0.3\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0.1\\y=0.2\end{matrix}\right.\)
\(m_{CO_2}=3x+3y=3\cdot0.1+3\cdot0.2=0.9g\\ m_{H_2O}=4x+4y=4\cdot0.1+4\cdot0.2=1,2g\)