*해설

<문제 해설>
CO+0.5O2->CO2
1Sm^3:0.5Sm^3:1Sm^3
Oo=0.5Sm^3
Ao=Oo/0.21=2.381Sm^3
God=(1-0.21)Ao+CO2
=0.79×2.381+1
=2.88Sm^3
CO2(max)=CO2/God ×100%
=1/2.88 ×100%=34.71%