n(混合气体)=8.96/22.4=0.4n(CO2)=26.4/44=0.6
CO(或CH4)Xmol C2H2 Ymol
X+Y = 0.4x+2Y = 0.6
X=0.2Y=0.2
w=0.2/(0.2+0.2)=50%