Gọi số mol Etilen: C2H4 : xmol
Ta có :
\(2n_{C2H4}=n_{CO2}\Rightarrow n_{CO2}=2x\)
\(4n_{C2H4}=2n_{H2O}\Rightarrow n_{H2O}=2x\)
\(m_{CO2}+m_{H2O}=15,5\)
\(\Leftrightarrow44.2x+18.2x=15,5\)
\(\Rightarrow x=0,125\)
\(\Rightarrow V_{C2H4}=0,125.22,4=2,8\left(l\right)\)
Đặt \(n_{C_2H_4}=x\left(mol\right)\)
\(C_2H_4+3O_2\overset{t^o}{\rightarrow}2CO_2+2H_2O\)
x______________2x_______2x
\(\Rightarrow m_{CO_2}+m_{H_2O}=124x=15,5\\ \Rightarrow x=0,125\\ \Rightarrow V=2,8\left(l\right)\)
Chọn B