C2H4+3O2-to>2CO2+2H2O
0,3-------0,2-------0,2
n C2H4=\(\dfrac{4,48}{22,4}\)=0,2 mol
n O2=\(\dfrac{6,72}{22,4}\)=0,3 mol
=>C2H4 dư
=>VCO2=VH2O=0,2.22,4=4,48l
=>VC2H4 dư=0,1.22,4=2,24l
\(n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ n_{C_2H_4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ C_2H_4+3O_2\rightarrow\left(t^o\right)2CO_2+2H_2O\\ Vì:\dfrac{0,2}{1}>\dfrac{0,3}{3}\Rightarrow C_2H_4dư\\ \Rightarrow n_{CO_2}=\dfrac{2}{3}.0,3=0,2\left(mol\right)\\ n_{C_2H_4\left(dư\right)}=0,2-\dfrac{0,3}{3}=0,1\left(mol\right)\\ \Rightarrow V_{CO_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ V_{C_2H_4\left(dư\right)}=0,1.22,4=2,24\left(l\right)\)