a, \(PTHH:CH_4+2O_2\underrightarrow{to}2H_2O+CO_2\left(1\right)\)
\(C_2H_4+3O_2\underrightarrow{^{to}}2H_2O+CO_2\left(2\right)\)
b,
\(V_{CH4}=20\%.11,2=6,72\left(l\right)\rightarrow n_{CH4}=\frac{6,72}{22,4}=0,3\left(mol\right)\)
\(V_{C2H4}=11,2-6,72=4,48\left(l\right)\rightarrow n_{C2H4}=\frac{4,48}{22,4}=0,2\left(mol\right)\)
Theo PT(1) : \(n_{O_2}=2n_{CH4}=2.0,3=0,6\left(mol\right)\)
\(\rightarrow V_{O2\left(1\right)}=n_{O2}.22,4=0,6.22,4=13,44\left(l\right)\)
Theo PT(2) : \(n_{O_2}=3n_{C2H4}=3.0,2=0,6\left(mol\right)\)
\(\rightarrow V_{O2\left(2\right)}=n_{O2}.22,4=0,6.22,4=13,44\left(l\right)\)
\(\rightarrow\Sigma n_{O2}=13,44+13,44=26,88\left(l\right)\)