a. \(n_X=\dfrac{V_{O_2}}{22,4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
\(n_{CO_2}=\dfrac{V_{O_2}}{22,4}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
+ Bảo toàn C:
\(\Rightarrow n_{CH_4}+2n_{C_2H_4}=0,3\left(mol\right)\)
Mà: \(n_{CH_4}+n_{C_2H_4}=0,2\left(mol\right)\)
\(\Rightarrow0,2+n_{C_2H_4}=0,3\)
\(\Leftrightarrow n_{C_2H_4}=0,3-0,2=0,1\left(mol\right)\)
Phần trăm theo thể tích từng khí X là:
\(\%V_{C_2H_4}=\dfrac{0,1.100\%}{0,2}=50\%\)
\(\%V_{C_2H_4}=100\%-50\%=50\%\)
b. Bảo toàn H
\(\Rightarrow n_H=4n_{CH_4}+4n_{C_2H_4}\)
\(\Leftrightarrow n_H=4\left(n_{CH_4}+n_{C_2H_4}\right)\)
\(\Leftrightarrow n_H=4\left(0,1+0,1\right)\)
\(\Leftrightarrow n_H=4.0,2=0,8\left(mol\right)\)
\(\Rightarrow n_{H_2O}=\dfrac{n_H}{2}=\dfrac{0,8}{2}=0,4\left(mol\right)\)
Khối lượng nước thu được:
\(\Rightarrow m_{H_2O}=n_{H_2O}.M_{H_2O}=0,4.18=7,2\left(g\right)\)